BAEL-1044 - Introduction to NoException (#2394)

* BAEL-1044 - Introduction to NoException

* BAEL-1044 - Introduction to NoException
This commit is contained in:
Eric Goebelbecker 2017-08-09 02:19:15 -04:00 committed by maibin
parent 415b80d03f
commit 2036138ed1
5 changed files with 113 additions and 0 deletions

2
noexception/README.md Normal file
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### Relevant Articles:
- [Introduction to NoException](http://www.baeldung.com/intrduction-to-noexception)

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noexception/pom.xml Normal file
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.baeldung</groupId>
<artifactId>noexception</artifactId>
<version>1.0</version>
<name>noexception</name>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
</parent>
<dependencies>
<dependency>
<groupId>com.machinezoo.noexception</groupId>
<artifactId>noexception</artifactId>
<version>1.1.0</version>
</dependency>
</dependencies>
</project>

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package com.baeldung.noexception;
import com.machinezoo.noexception.ExceptionHandler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class CustomExceptionHandler extends ExceptionHandler {
private Logger logger = LoggerFactory.getLogger(CustomExceptionHandler.class);
@Override
public boolean handle(Throwable throwable) {
if (throwable.getClass()
.isAssignableFrom(RuntimeException.class)
|| throwable.getClass()
.isAssignableFrom(Error.class)) {
return false;
} else {
logger.error("Caught Exception ", throwable);
return true;
}
}
}

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package com.baeldung.noexception;
import com.machinezoo.noexception.Exceptions;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class NoExceptionUnitTest {
private static Logger logger = LoggerFactory.getLogger(NoExceptionUnitTest.class);
@Test
public void whenStdExceptionHandling_thenCatchAndLog() {
try {
System.out.println("Result is " + Integer.parseInt("foobar"));
} catch (Throwable exception) {
logger.error("Caught exception:", exception);
}
}
@Test
public void whenDefaultNoException_thenCatchAndLog() {
Exceptions.log().run(() -> System.out.println("Result is " + Integer.parseInt("foobar")));
}
@Test
public void givenLogger_whenDefaultNoException_thenCatchAndLogWithClassName() {
System.out.println("Result is " + Exceptions.log(logger).get(() -> +Integer.parseInt("foobar")).orElse(-1));
}
@Test
public void givenLoggerAndMessage_whenDefaultNoException_thenCatchAndLogWithClassNameAndMessage() {
System.out.println("Result is " + Exceptions.log(logger, "Something went wrong:").get(() -> +Integer.parseInt("foobar")).orElse(-1));
}
@Test
public void givenDefaultValue_whenDefaultNoException_thenCatchAndLogPrintDefault() {
System.out.println("Result is " + Exceptions.log(logger, "Something went wrong:").get(() -> +Integer.parseInt("foobar")).orElse(-1));
}
@Test(expected = Error.class)
public void givenCustomHandler_whenError_thenRethrowError() {
CustomExceptionHandler customExceptionHandler = new CustomExceptionHandler();
customExceptionHandler.run(() -> throwError());
}
@Test
public void givenCustomHandler_whenException_thenCatchAndLog() {
CustomExceptionHandler customExceptionHandler = new CustomExceptionHandler();
customExceptionHandler.run(() -> throwException());
}
private static void throwError() {
throw new Error("This is very bad.");
}
private static void throwException() {
String testString = "foo";
testString.charAt(5);
}
}

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<module>mockito2</module>
<module>mocks</module>
<module>mustache</module>
<module>noexception</module>
<module>orika</module>