Clarify missing java error message (#46160)

Since the bundled jdk was added to Elasticsearch, there are now 2 ways
java can be missing. Either JAVA_HOME is set but does not exist, or the
bundled jdk does not exist. This commit improves the error messages in
those two cases, and also ensures our tests cover both cases.

distribution/src/bin/elasticsearch-env

@@ -38,6 +38,7 @@ ES_CLASSPATH="$ES_HOME/lib/*"
 # now set the path to java
 if [ ! -z "$JAVA_HOME" ]; then
   JAVA="$JAVA_HOME/bin/java"
+  JAVA_TYPE="JAVA_HOME"
 else
   if [ "$(uname -s)" = "Darwin" ]; then
     # OSX has a different structure
@@ -45,10 +46,11 @@ else
   else
     JAVA="$ES_HOME/jdk/bin/java"
   fi
+  JAVA_TYPE="bundled jdk"
 fi
 
 if [ ! -x "$JAVA" ]; then
-  echo "could not find java in JAVA_HOME or bundled at $JAVA" >&2
+    echo "could not find java in $JAVA_TYPE at $JAVA" >&2
     exit 1
   fi
 

distribution/src/bin/elasticsearch-env.bat

@@ -38,13 +38,15 @@ if "%1" == "nojava" (
 
 if defined JAVA_HOME (
   set JAVA="%JAVA_HOME%\bin\java.exe"
+  set JAVA_TYPE=JAVA_HOME
 ) else (
   set JAVA="%ES_HOME%\jdk\bin\java.exe"
   set JAVA_HOME="%ES_HOME%\jdk"
+  set JAVA_TYPE=bundled jdk
 )
 
-if not exist %JAVA% (
-  echo "could not find java in JAVA_HOME or bundled at %ES_HOME%\jdk" >&2
+if not exist !JAVA! (
+  echo "could not find java in !JAVA_TYPE! at !JAVA!" >&2
   exit /b 1
 )
 

qa/os/src/test/java/org/elasticsearch/packaging/test/ArchiveTests.java

@@ -74,7 +74,7 @@ public class ArchiveTests extends PackagingTestCase {
         assertThat(r.stdout, isEmptyString());
     }
 
-    public void test30NoJava() throws Exception {
+    public void test30MissingBundledJdk() throws Exception {
         final Installation.Executables bin = installation.executables();
         sh.getEnv().remove("JAVA_HOME");
 
@@ -87,7 +87,7 @@ public class ArchiveTests extends PackagingTestCase {
             // ask for elasticsearch version to quickly exit if java is actually found (ie test failure)
             final Result runResult = sh.runIgnoreExitCode(bin.elasticsearch.toString() + " -v");
             assertThat(runResult.exitCode, is(1));
-            assertThat(runResult.stderr, containsString("could not find java in JAVA_HOME or bundled"));
+            assertThat(runResult.stderr, containsString("could not find java in bundled jdk"));
         } finally {
             if (distribution().hasJdk) {
                 mv(relocatedJdk, installation.bundledJdk);
@@ -95,6 +95,17 @@ public class ArchiveTests extends PackagingTestCase {
         }
     }
 
+    public void test31BadJavaHome() throws Exception {
+        final Installation.Executables bin = installation.executables();
+        sh.getEnv().put("JAVA_HOME", "doesnotexist");
+
+        // ask for elasticsearch version to quickly exit if java is actually found (ie test failure)
+        final Result runResult = sh.runIgnoreExitCode(bin.elasticsearch.toString() + " -v");
+        assertThat(runResult.exitCode, is(1));
+        assertThat(runResult.stderr, containsString("could not find java in JAVA_HOME"));
+
+    }
+
     public void test40CreateKeystoreManually() throws Exception {
         final Installation.Executables bin = installation.executables();
 

qa/os/src/test/java/org/elasticsearch/packaging/test/WindowsServiceTests.java

@@ -117,20 +117,27 @@ public class WindowsServiceTests extends PackagingTestCase {
         sh.run(serviceScript + " remove");
     }
 
-    public void test13InstallMissingJava() throws IOException {
+    public void test13InstallMissingBundledJdk() throws IOException {
         final Path relocatedJdk = installation.bundledJdk.getParent().resolve("jdk.relocated");
 
         try {
             mv(installation.bundledJdk, relocatedJdk);
             Result result = sh.runIgnoreExitCode(serviceScript + " install");
             assertThat(result.exitCode, equalTo(1));
-            assertThat(result.stderr, containsString("could not find java in JAVA_HOME or bundled"));
+            assertThat(result.stderr, containsString("could not find java in bundled jdk"));
         } finally {
             mv(relocatedJdk, installation.bundledJdk);
         }
     }
 
-    public void test14RemoveNotInstalled() {
+    public void test14InstallBadJavaHome() throws IOException {
+        sh.getEnv().put("JAVA_HOME", "doesnotexist");
+        Result result = sh.runIgnoreExitCode(serviceScript + " install");
+        assertThat(result.exitCode, equalTo(1));
+        assertThat(result.stderr, containsString("could not find java in JAVA_HOME"));
+    }
+
+    public void test15RemoveNotInstalled() {
         Result result = assertFailure(serviceScript + " remove", 1);
         assertThat(result.stdout, containsString("Failed removing '" + DEFAULT_ID + "' service"));
     }

qa/os/src/test/java/org/elasticsearch/packaging/util/ServerUtils.java

@@ -72,7 +72,7 @@ public class ServerUtils {
 
             } catch (HttpHostConnectException e) {
                 // we want to retry if the connection is refused
-                LOG.debug("Got connection refused when waiting for cluster health", e);
+                LOG.info("Got connection refused when waiting for cluster health", e);
             }
 
             timeElapsed = System.currentTimeMillis() - startTime;