Add jndi docs to operations guide.
Signed-off-by: Jan Bartel <janb@webtide.com>
This commit is contained in:
Jan Bartel
parent
e99f5835e9
commit
95998a2ee3
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@ -22,7 +22,6 @@
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Jetty supports `java:comp/env` lookups in webapps.
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This is an optional feature for which some configuration is required.
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include::quick-jndi-setup.adoc[]
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include::using-jndi.adoc[]
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include::jndi-configuration.adoc[]
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include::jndi-embedded.adoc[]
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@ -1,45 +0,0 @@
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//
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// ========================================================================
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// Copyright (c) 1995-2020 Mort Bay Consulting Pty Ltd and others.
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//
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// This program and the accompanying materials are made available under
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// the terms of the Eclipse Public License 2.0 which is available at
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// https://www.eclipse.org/legal/epl-2.0
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//
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// This Source Code may also be made available under the following
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// Secondary Licenses when the conditions for such availability set
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// forth in the Eclipse Public License, v. 2.0 are satisfied:
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// the Apache License v2.0 which is available at
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
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// ========================================================================
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//
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[[jndi-quick-setup]]
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=== Quick Setup
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If you are using the standard distribution of Jetty, you must enable the _JNDI_ link:#startup-modules[module] to obtain Jetty's JNDI implementation, and the *plus* link:#startup-modules[module] which provides classes for interacting with JNDI.
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As the _plus_ module depends on the _JNDI_ module, you only need to enable the _plus_ module to enable both.
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Assuming you have Jetty installed in `/opt/jetty`, and you have made a link:#startup-base-and-home[jetty base] in `/opt/jetty/my-base`, do:
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[source,screen,subs="{sub-order}"]
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....
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$ cd /opt/jetty
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$ cd my-base
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$ java -jar $JETTY_HOME/start.jar --add-to-start=plus
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....
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You can now start Jetty and use JNDI within your webapps.
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See link:#using-jndi[Using JNDI] for information on how to add entries to the JNDI environment that Jetty can look up within webapps.
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If you have extra jars associated with your JNDI resources, for example a database driver jar, and you haven't made a custom link:#startup-modules[module] for it, you can put the jars into your `{$jetty base}ext/` directory.
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You will then need to enable the _ext_ module to ensure the jars in the `ext/` directory are on the classpath.
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Assuming you have Jetty installed in `/opt/jetty`, and you have made a link:#startup-base-and-home[jetty base] in `/opt/jetty/my-base`, do:
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[source,screen,subs="{sub-order}"]
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....
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$ cd /opt/jetty
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$ cd my-base
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$ java -jar $JETTY_HOME/start.jar --add-to-start=ext
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....
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@ -36,3 +36,4 @@ include::sessions/chapter.adoc[]
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include::quickstart/chapter.adoc[]
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include::annotations/chapter.adoc[]
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include::jsp/chapter.adoc[]
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include::jndi/chapter.adoc[]
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@ -34,6 +34,7 @@ If you know Eclipse Jetty already, jump to a feature:
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* xref:og-quickstart[Faster Web Application Deployment]
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* xref:og-annotations[Annotations]
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* xref:og-jsp[JSP]
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* xref:og-jndi[JNDI]
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TODO
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@ -0,0 +1,398 @@
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//
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// ========================================================================
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// Copyright (c) 1995-2020 Mort Bay Consulting Pty Ltd and others.
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//
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// This program and the accompanying materials are made available under
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// the terms of the Eclipse Public License 2.0 which is available at
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// https://www.eclipse.org/legal/epl-2.0
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//
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// This Source Code may also be made available under the following
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// Secondary Licenses when the conditions for such availability set
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// forth in the Eclipse Public License, v. 2.0 are satisfied:
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// the Apache License v2.0 which is available at
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
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// ========================================================================
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//
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[[og-jndi]]
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=== JNDI
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Enable the `plus` module in order to be able to use JNDI resources in your webapp.
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If you already have the `annotations` module enabled, then it will already be enabled.
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If you have extra jars associated with your JNDI resources, eg database drivers etc, that are not located inside your webapp then you should place those jars into your `$jetty.base/lib/ext` directory.
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If your base doesn't already contain this directory, then enable the `ext` module, and Jetty will create the directory for you and ensure its contents are on the server's classpath.
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You can now declare JNDI resources and reference them within your webapps.
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==== Declaring resources
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You must declare the objects you want bound into the environment so that you can then hook them into your webapp via `env-entry`, `resource-ref` and `resource-env-refs` in `web.xml`, `web-fragment.xml` or `override-web.xml`.
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You make these declarations in Jetty XML files that are either _external_ or _internal_ to your webapp.
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A server or context XML file is external to your webapp.
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The special `WEB-INF/jetty-env.xml` file is internal to your webapp.
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See the section on link:#og-jndi-xml[Jetty XML files] for more information on how to choose in which XML file to place your declarations.
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For now, let's look at _what_ you declare in the XML file, regardless of its location.
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Declaring a JDNI resource to be referenced later in your webapp is accomplished by declaring new instances of the following types:
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link:#og-jndi-env[`org.eclipse.jetty.plus.jndi.EnvEntry`]::
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Used for `env-entry` type of entries
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link:#og-jndi-resource[`org.eclipse.jetty.plus.jndi.Resource`]::
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Used for most other type of resources
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link:#og-jndi-tx[`org.eclipse.jetty.plus.jndi.Transaction`]::
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For a JTA manager
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link:#og-jndi-link[`org.eclipse.jetty.plus.jndi.Link`]::
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For the link between a `web.xml` resource name and a naming entry
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Declarations of each of these types follow a similar pattern:
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[source,xml,subs=verbatim]
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----
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<New class="org.eclipse.jetty.plus.jndi.xxxx"> <1>
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<Arg><!-- scope --></Arg> <2>
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<Arg><!-- name --></Arg> <3>
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<Arg><!-- value --></Arg> <4>
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</New>
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----
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<1> Defines a resource to Jetty.
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<2> Specifies the link:#og-jndi-scope[scope] of the resource.
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<3> Specifies the name of the resource which will be looked up by the webapp relative to the `java:comp/env` namespace.
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<4> Specifies the value of the resource.
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[[og-jndi-env]]
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===== org.eclipse.jetty.plus.jndi.EnvEntry
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Sometimes it is useful to pass configuration information to a webapp at runtime that you either cannot or cannot conveniently code into a `web.xml` `<env-entry>`.
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In such cases, you can use the `org.eclipse.jetty.plus.jndi.EnvEntry` class, and optionally even override an entry of the same name in `web.xml`.
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Here's an example that defines the equivalent of an `env-entry` called `mySpecialValue` with value `4000` that overrides an `<env-entry>` declaration of the same name in web.xml:
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[source,xml,subs=verbatim]
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----
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<New class="org.eclipse.jetty.plus.jndi.EnvEntry"> <1>
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<Arg></Arg> <2>
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<Arg>mySpecialValue</Arg> <3>
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<Arg type="java.lang.Integer">4000</Arg> <4>
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<Arg type="boolean">true</Arg> <5>
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</New>
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----
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<1> Define an `EnvEntry` that corresponds to an `<env-entry>`.
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<2> link:#og-jndi-scope[Scoped] at the JVM level.
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<3> The name of the entry, corresponding to a lookup by the webapp of `java:comp/env/mySpecialValue`.
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<4> The value of the entry, in this case the integer value `4000`.
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<5> `true` means to override the value of an `<env-entry>` of the same name in `web.xml`.
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Note that if you don't want to override the `web.xml` value, simply omit the last argument, or set it to `false`.
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The Servlet Specification allows binding only the following object types to an `env-entry`:
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* java.lang.String
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* java.lang.Integer
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* java.lang.Float
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* java.lang.Double
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* java.lang.Long
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* java.lang.Short
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* java.lang.Character
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* java.lang.Byte
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* java.lang.Boolean
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Jetty is a little more flexible and allows you to also bind:
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* custom POJOs
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* http://docs.oracle.com/javase/1.5.0/docs/api/javax/naming/Reference.html[`javax.naming.References`]
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* http://docs.oracle.com/javase/1.5.0/docs/api/javax/naming/Referenceable.html[`javax.naming.Referenceables`]
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Be aware that if you take advantage of this feature, your web application is __not portable__.
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[[og-jndi-resource]]
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===== org.eclipse.jetty.plus.jndi.Resource
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You can configure any type of resource that you want to refer to in `web.xml` via a `resource-ref` or `resource-env-ref` by using the `org.eclipse.jetty.plus.jndi.Resource` type of naming entry.
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You provide the scope, the name of the object (relative to `java:comp/env`) and a POJO, `javax.naming.Reference` or `javax.naming.Referenceable` instance.
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Let's examine how to configure some of the most common types of resources.
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====== DataSources
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In this example, we'll configure a http://db.apache.org/derby[Derby] DataSource named `jdbc/myds`:
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[source,xml,subs=verbatim]
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----
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<Configure id='wac' class="org.eclipse.jetty.webapp.WebAppContext">
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<New class="org.eclipse.jetty.plus.jndi.Resource">
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<Arg><Ref refid="wac"/></Arg>
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<Arg>jdbc/myds</Arg>
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<Arg>
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<New class="org.apache.derby.jdbc.EmbeddedDataSource">
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<Set name="DatabaseName">test</Set>
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<Set name="createDatabase">create</Set>
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</New>
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</Arg>
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</New>
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</Configure>
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----
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This would linked into the webapps JNDI namespace via an entry in a `web.xml` like so:
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[source,xml,subs=verbatim]
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----
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<resource-ref>
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<res-ref-name>jdbc/myds</res-ref-name>
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<res-type>javax.sql.DataSource</res-type>
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<res-auth>Container</res-auth>
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</resource-ref>
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----
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[NOTE]
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====
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When configuring Resources, ensure that the type of object you configure matches the type of object you expect to look up in `java:comp/env`.
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For database connection factories, this means that the object you register as a Resource _must_ implement the `javax.sql.DataSource` interface.
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Also note that the http://jcp.org/aboutJava/communityprocess/pr/jsr244/index.html[J2EE Specification] recommends storing DataSources relative to `jdbc/` and thus looked up by the application as `java:comp/env/jdbc/xxx`.
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Eg The Datasource bound in Jetty as `jdbc/users` would be looked up by the application as `java:comp/env/jdbc/users`
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====
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//TODO For more examples of datasource configurations, see xref:jndi-datasource-examples[].
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====== JMS Queues, Topics and ConnectionFactories
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Jetty can bind any implementation of the JMS destinations and connection factories.
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Here is an example of binding an http://activemq.apache.org[ActiveMQ] in-JVM connection factory:
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[source,xml,subs=verbatim]
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----
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<Configure id='wac' class="org.eclipse.jetty.webapp.WebAppContext">
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<New class="org.eclipse.jetty.plus.jndi.Resource">
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<Arg><Ref refid='wac'/></Arg>
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<Arg>jms/connectionFactory</Arg>
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<Arg>
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<New class="org.apache.activemq.ActiveMQConnectionFactory">
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<Arg>vm://localhost?broker.persistent=false</Arg>
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</New>
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</Arg>
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</New>
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</Configure>
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----
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The corresponding entry in `web.xml` to bind the ConnectionFactory into the webapp's JNDI namespace would be:
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[source,xml,subs=verbatim]
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----
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<resource-ref>
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<res-ref-name>jms/connectionFactory</res-ref-name>
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<res-type>javax.jms.ConnectionFactory</res-type>
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<res-auth>Container</res-auth>
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</resource-ref>
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----
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[NOTE]
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====
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The http://jcp.org/aboutJava/communityprocess/pr/jsr244/index.html[J2EE Specification] recommends storing JMS connection factories under `jms/`.
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Eg The ConnectionFactory bound in Jetty as `jms/inqueue` would be looked up by the application as `java:comp/env/jms/inqueue`.
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====
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====== Mail
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To configure access to `javax.mail.Session` from within a webapp, declare an `org.eclipse.jetty.plus.jndi.Resource` with an `org.eclipse.jetty.jndi.factories.MailSessionReference` that will hold the mail configuration and create the instance of the `Session` when it is referenced:
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[source,xml,subs=verbatim]
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----
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<Configure id='wac' class="org.eclipse.jetty.webapp.WebAppContext">
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<New class="org.eclipse.jetty.plus.jndi.Resource">
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<Arg><Ref refid="wac"/></Arg>
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<Arg>mail/Session</Arg>
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<Arg>
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<New class="org.eclipse.jetty.jndi.factories.MailSessionReference"> <1>
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<Set name="user">fred</Set> <2>
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<Set name="password">OBF:1xmk1w261z0f1w1c1xmq</Set> <3>
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<Set name="properties"> <4>
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<New class="java.util.Properties">
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<Put name="mail.smtp.host">XXX</Put>
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<Put name="mail.from">me@me</Put>
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<Put name="mail.debug">true</Put>
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</New>
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</Set>
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</New>
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</Arg>
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</New>
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</Configure>
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----
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<1> Use the `org.eclipse.jetty.jndi.factories.MailSessionReference` class to hold the configuration.
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<2> Set the username for the mail instance.
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<3> Set the password for the mail instance - use Jetty's secure password obfuscation to obscure the password.
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<4> Set all other applicable properties.
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The webapp performs a lookup for `java:comp/env/mail/Session` at runtime and obtains a `javax.mail.Session` that has the correct configuration to permit it to send email via SMTP.
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[NOTE]
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====
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Jetty does not provide the `javax.mail` and `javax.activation` jars.
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Note also that the http://jcp.org/aboutJava/communityprocess/pr/jsr244/index.html[J2EE Specification] recommends storing JavaMail connection factories under `mail/`.
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Eg The `MailSessionReference` bound to jetty as `mail/smtp` would be looked up by the application as `java:comp/env/mail/smtp`.
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====
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[[og-jndi-tx]]
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===== org.eclipse.jetty.plus.jndi.Transaction
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To perform distributed transactions with your resources, a _transaction manager_ that supports the JTA interfaces is required.
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The transaction manager is looked up by the application as `java:comp/UserTransaction`.
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Jetty does not ship with a JTA manager, but _does_ provide the infrastructure to plug in the JTA manager of your choice.
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Use the link:{JDURL}/org/eclipse/jetty/plus/jndi/Transaction.html[org.eclipse.jetty.plus.jndi.Transaction] object in a link:#og-jndi-xml[Jetty XML file] to configure the JTA manager.
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The following example configures the http://www.atomikos.com/[Atomikos] transaction manager:
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[source,xml,subs=verbatim]
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----
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<New id="tx" class="org.eclipse.jetty.plus.jndi.Transaction">
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<Arg>
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<New class="com.atomikos.icatch.jta.J2eeUserTransaction"/>
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</Arg>
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</New>
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----
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Jetty will automatically bind this JTA manager to the webapp's JNDI namespace at `java:comp/UserTransaction`.
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[[og-jndi-link]]
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===== org.eclipse.jetty.plus.jndi.Link
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Usually, the name you provide for the `org.eclipse.jetty.plus.jndi.Resource` is the same name you reference in `web.xml`.
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This ensures that the two are linked together and thus accessible to your webapp.
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However, if the names cannot be the same, then it is possible to effectively alias one to another using an `org.eclipse.jetty.plus.jndi.Link`.
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Let's look at an example.
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Supposing you have a declaration for a Datasource named `jdbc/workforce` in a Jetty context XML file, but your web.xml wants to link to a `<resource-ref>` named `jdbc/employees`, and you cannot edit the web.xml.
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You can create a `WEB-INF/jetty-env.xml` file with an `org.eclipse.jetty.plus.jndi.Link` that ties together the names `jdbc/workforce` and `jdbc/employees`:
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The context XML file declares `jdbc/workforce`:
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[source,xml,subs=verbatim]
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----
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<Configure id='wac' class="org.eclipse.jetty.webapp.WebAppContext">
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<New class="org.eclipse.jetty.plus.jndi.Resource">
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<Arg><Ref refid="wac"/></Arg>
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<Arg>jdbc/workforce</Arg>
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<Arg>
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<New class="org.apache.derby.jdbc.EmbeddedDataSource">
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<Set name="DatabaseName">test</Set>
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<Set name="createDatabase">create</Set>
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</New>
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</Arg>
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</New>
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</Configure>
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----
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The `web.xml` refers to it as `jdbc/employees`:
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[source,xml,subs=verbatim]
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----
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<resource-ref>
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<res-ref-name>jdbc/employees</res-ref-name>
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<res-type>javax.sql.DataSource</res-type>
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<res-auth>Container</res-auth>
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</resource-ref>
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----
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Create a `WEB-INF/jetty-env.xml` file with a `org.eclipse.jetty.plus.jndi.Link` to link these names together:
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[source,xml,subs=verbatim]
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----
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<New class="org.eclipse.jetty.plus.jndi.Link">
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<Arg><Ref refid='wac'/></Arg>
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<Arg>jdbc/employees</Arg> <1>
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<Arg>jdbc/workforce</Arg> <2>
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</New>
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----
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<1> The name as referenced in the `web.xml` file.
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<2> The name as referenced in the context XML file.
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[[og-jndi-xml]]
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===== Jetty XML files
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You can define naming resources in three places:
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Server XML file::
|
||||
Naming resources defined in a server XML file are link:#og-jndi-scope[scoped] at either the JVM level or the `org.eclipse.jetty.server.Server` level.
|
||||
The classes for the resource _must_ be visible at the Jetty *container* level.
|
||||
If instead the classes for the resource only exist inside your webapp, you must declare it in a `WEB-INF/jetty-env.xml` file.
|
||||
WEB-INF/jetty-env.xml::
|
||||
Naming resources in a `WEB-INF/jetty-env.xml` file are link:#og-jndi-scope[scoped] to the webapp in which the file resides.
|
||||
While you can enter JVM or Server scopes if you choose, we do not recommend doing so.
|
||||
The resources defined here may use classes from inside your webapp.
|
||||
This is a Jetty-specific mechanism.
|
||||
Context XML file::
|
||||
Entries in a context XML file should be link:#og-jndi-scope[scoped] at the level of the webapp to which they apply (although it is possible to use a less strict scoping level of Server or JVM, but not recommended).
|
||||
As with resources declared in a server XML file, classes associated with the resource _must_ be visible on the *container's* classpath.
|
||||
|
||||
[[og-jndi-scope]]
|
||||
===== Resource scoping
|
||||
|
||||
Naming resources within Jetty belong to one of three different scopes, in increasing order of restrictiveness:
|
||||
|
||||
*JVM scope:*
|
||||
The name is unique across the JVM instance, and is visible to all application code.
|
||||
This scope is represented by a `null` first parameter to the resource declaration.
|
||||
For example:
|
||||
[source,xml,subs=verbatim]
|
||||
----
|
||||
<New id="cf" class="org.eclipse.jetty.plus.jndi.Resource">
|
||||
<Arg></Arg> <1>
|
||||
<Arg>jms/connectionFactory</Arg>
|
||||
<Arg>
|
||||
<New class="org.apache.activemq.ActiveMQConnectionFactory">
|
||||
<Arg>vm://localhost?broker.persistent=false</Arg>
|
||||
</New>
|
||||
</Arg>
|
||||
</New>
|
||||
----
|
||||
<1> Empty first arg equates to JVM scope for the object bound to name `jms/connectionFactory`.
|
||||
|
||||
*Server scope:*
|
||||
The name is unique to a Server instance, and is only visible to applications associated with that instance.
|
||||
This scope is represented by referencing the Server instance as the first parameter to the resource declaration.
|
||||
For example:
|
||||
[source,xml,subs=verbatim]
|
||||
----
|
||||
<New id="cf" class="org.eclipse.jetty.plus.jndi.Resource">
|
||||
<Arg><Ref refid="Server"/></Arg> <1>
|
||||
<Arg>jms/connectionFactory</Arg>
|
||||
<Arg>
|
||||
<New class="org.apache.activemq.ActiveMQConnectionFactory">
|
||||
<Arg>vm://localhost?broker.persistent=false</Arg>
|
||||
</New>
|
||||
</Arg>
|
||||
</New>
|
||||
----
|
||||
<1> We refer to the id `Server` which identifies the default `org.eclipse.jetty.server.Server` instance.
|
||||
|
||||
*Webapp scope:*
|
||||
The name is unique to the `org.eclipse.jetty.webapp.WebAppContext` instance, and is only visible to that application.
|
||||
This scope is represented by referencing the instance as the first parameter to the resource declaration.
|
||||
For example:
|
||||
[source,xml,subs=verbatim]
|
||||
----
|
||||
<New class="org.eclipse.jetty.plus.jndi.Resource">
|
||||
<Arg><Ref refid='wac'/></Arg> <1>
|
||||
<Arg>jms/connectionFactory</Arg>
|
||||
<Arg>
|
||||
<New class="org.apache.activemq.ActiveMQConnectionFactory">
|
||||
<Arg>vm://localhost?broker.persistent=false</Arg>
|
||||
</New>
|
||||
</Arg>
|
||||
</New>
|
||||
----
|
||||
<1> We refer to an instance of an `org.eclipse.jetty.webapp.WebAppContext` which has been previously defined.
|
||||
Loading…
Reference in New Issue