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<div class="section"><h2>Log4j 2 API<a name="Log4j_2_API"></a></h2>
<a name="FlowTracing"></a>
<div class="section"><h3>Flow Tracing<a name="Flow_Tracing"></a></h3>
<p>
The Logger class provides logging methods that are quite useful for following the
execution path of applications. These methods generate logging events that can be filtered
separately from other debug logging. Liberal use of these methods is encouraged as the output has
been found to
</p>
<ul>
<li>aid in problem diagnosis in development without requiring a debug session</li>
<li>aid in problem diagnosis in production where no debugging is possible</li>
<li>help educate new developers in learning the application.</li>
</ul>
<p>
The two most used methods are the entry() and exit() methods. entry() should be placed at the
beginning of methods, except perhaps for simple getters and setters. entry() can be called
passing from 0 to 4 parameters. Typically these will be parameters passed to the method.
The entry() method logs with a level of TRACE and uses a Marker with a name of &quot;ENTER&quot; which
is also a &quot;FLOW&quot; Marker.
</p>
<p>
The exit() method should be placed before any return statement or as the last statement of
methods without a return. exit() can be called with or without a parameter. Typically, methods
that return void will use exit() while methods that return an Object will use exit(Object obj).
The entry() method logs with a level of TRACE and uses a Marker with a name of &quot;EXIT&quot; which is
also a &quot;FLOW&quot; Marker.
</p>
<p>
The throwing() method can be used by an application when it is throwing an exception that is
unlikely to be handled, such as a RuntimeException. This will insure that proper diagnostics
are available if needed. The logging event generated will have a level of ERROR and will have
an associated Marker with a name of &quot;THROWING&quot; which is also an &quot;EXCEPTION&quot; Marker.
</p>
<p>
The catching() method can be used by an application when it catches an Exception that it is not
going to rethrow, either explicitly or attached to another Exception. The logging event generated
will have a level of ERROR and will have an associated Marker with a name of &quot;CATCHING&quot; which is
also an &quot;EXCEPTION&quot; Marker.
</p>
<p>
The following example shows a simple application using these methods in a fairly typcial manner. The
throwing() is not present since no Exceptions are explicitly thrown and not handled.
</p>
<div class="prettyprint linenums"><pre>
package com.test;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.LogManager;
import java.util.Random;
public class TestService {
private Logger logger = LogManager.getLogger(TestService.class.getName());
private String[] messages = new String[] {
&quot;Hello, World&quot;,
&quot;Goodbye Cruel World&quot;,
&quot;You had me at hello&quot;
};
private Random rand = new Random(1);
public String retrieveMessage() {
logger.entry();
String testMsg = getMessage(getKey());
return logger.exit(testMsg);
}
public void exampleException() {
logger.entry();
try {
String msg = messages[messages.length];
logger.error(&quot;An exception should have been thrown&quot;);
} catch (Exception ex) {
logger.catching(ex);
}
logger.exit();
}
public String getMessage(int key) {
logger.entry(key);
String value = messages[key];
return logger.exit(value);
}
private int getKey() {
logger.entry();
int key = rand.nextInt(messages.length);
return logger.exit(key);
}
}</pre></div>
<p>
This test application uses the preceding service to generate logging events.
</p>
<div class="prettyprint linenums"><pre>
package com.test;
public class App {
public static void main( String[] args ) {
TestService service = new TestService();
service.retrieveMessage();
service.retrieveMessage();
service.exampleException();
}
}</pre></div>
<p>
The configuration below will cause all output to be routed to target/test.log. The pattern for
the FileAppender includes the class name, line number and method name. Including these
in the pattern are critical for the log to be of value.
</p>
<div class="prettyprint linenums"><pre>
&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;
&lt;Configuration status=&quot;error&quot;&gt;
&lt;Appenders&gt;
&lt;Console name=&quot;Console&quot; target=&quot;SYSTEM_OUT&quot;&gt;
&lt;ThresholdFilter level=&quot;ERROR&quot; onMatch=&quot;ACCEPT&quot; onMismatch=&quot;DENY&quot;/&gt;
&lt;!-- Flow tracing is most useful with a pattern that shows location.
Below pattern outputs class, line number and method name. --&gt;
&lt;PatternLayout pattern=&quot;%d{HH:mm:ss.SSS} %-5level %class{36} %L %M - %msg%xEx%n&quot;/&gt;
&lt;/Console&gt;
&lt;File name=&quot;log&quot; fileName=&quot;target/test.log&quot; append=&quot;false&quot;&gt;
&lt;PatternLayout pattern=&quot;%d{HH:mm:ss.SSS} %-5level %class{36} %L %M - %msg%xEx%n&quot;/&gt;
&lt;/File&gt;
&lt;/Appenders&gt;
&lt;Loggers&gt;
&lt;Root level=&quot;trace&quot;&gt;
&lt;AppenderRef ref=&quot;log&quot;/&gt;
&lt;/Root&gt;
&lt;/Loggers&gt;
&lt;/Configuration&gt;</pre></div>
<p>
Here is the output that results from the Java classes and configuration above.
</p>
<div><pre>
19:08:07.056 TRACE com.test.TestService 19 retrieveMessage - entry
19:08:07.060 TRACE com.test.TestService 46 getKey - entry
19:08:07.060 TRACE com.test.TestService 48 getKey - exit with (0)
19:08:07.060 TRACE com.test.TestService 38 getMessage - entry parms(0)
19:08:07.060 TRACE com.test.TestService 42 getMessage - exit with (Hello, World)
19:08:07.060 TRACE com.test.TestService 23 retrieveMessage - exit with (Hello, World)
19:08:07.061 TRACE com.test.TestService 19 retrieveMessage - entry
19:08:07.061 TRACE com.test.TestService 46 getKey - entry
19:08:07.061 TRACE com.test.TestService 48 getKey - exit with (1)
19:08:07.061 TRACE com.test.TestService 38 getMessage - entry parms(1)
19:08:07.061 TRACE com.test.TestService 42 getMessage - exit with (Goodbye Cruel World)
19:08:07.061 TRACE com.test.TestService 23 retrieveMessage - exit with (Goodbye Cruel World)
19:08:07.062 TRACE com.test.TestService 27 exampleException - entry
19:08:07.077 DEBUG com.test.TestService 32 exampleException - catching java.lang.ArrayIndexOutOfBoundsException: 3
at com.test.TestService.exampleException(TestService.java:29) [classes/:?]
at com.test.App.main(App.java:9) [classes/:?]
at com.test.AppTest.testApp(AppTest.java:15) [test-classes/:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.6.0_29]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) ~[?:1.6.0_29]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) ~[?:1.6.0_29]
at java.lang.reflect.Method.invoke(Method.java:597) ~[?:1.6.0_29]
at org.junit.internal.runners.TestMethodRunner.executeMethodBody(TestMethodRunner.java:99) [junit-4.3.1.jar:?]
at org.junit.internal.runners.TestMethodRunner.runUnprotected(TestMethodRunner.java:81) [junit-4.3.1.jar:?]
at org.junit.internal.runners.BeforeAndAfterRunner.runProtected(BeforeAndAfterRunner.java:34) [junit-4.3.1.jar:?]
at org.junit.internal.runners.TestMethodRunner.runMethod(TestMethodRunner.java:75) [junit-4.3.1.jar:?]
at org.junit.internal.runners.TestMethodRunner.run(TestMethodRunner.java:45) [junit-4.3.1.jar:?]
at org.junit.internal.runners.TestClassMethodsRunner.invokeTestMethod(TestClassMethodsRunner.java:66) [junit-4.3.1.jar:?]
at org.junit.internal.runners.TestClassMethodsRunner.run(TestClassMethodsRunner.java:35) [junit-4.3.1.jar:?]
at org.junit.internal.runners.TestClassRunner$1.runUnprotected(TestClassRunner.java:42) [junit-4.3.1.jar:?]
at org.junit.internal.runners.BeforeAndAfterRunner.runProtected(BeforeAndAfterRunner.java:34) [junit-4.3.1.jar:?]
at org.junit.internal.runners.TestClassRunner.run(TestClassRunner.java:52) [junit-4.3.1.jar:?]
at org.apache.maven.surefire.junit4.JUnit4TestSet.execute(JUnit4TestSet.java:35) [surefire-junit4-2.7.2.jar:2.7.2]
at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:115) [surefire-junit4-2.7.2.jar:2.7.2]
at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:97) [surefire-junit4-2.7.2.jar:2.7.2]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.6.0_29]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) ~[?:1.6.0_29]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) ~[?:1.6.0_29]
at java.lang.reflect.Method.invoke(Method.java:597) ~[?:1.6.0_29]
at org.apache.maven.surefire.booter.ProviderFactory$ClassLoaderProxy.invoke(ProviderFactory.java:103) [surefire-booter-2.7.2.jar:2.7.2]
at $Proxy0.invoke(Unknown Source) [?:?]
at org.apache.maven.surefire.booter.SurefireStarter.invokeProvider(SurefireStarter.java:150) [surefire-booter-2.7.2.jar:2.7.2]
at org.apache.maven.surefire.booter.SurefireStarter.runSuitesInProcess(SurefireStarter.java:91) [surefire-booter-2.7.2.jar:2.7.2]
at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:69) [surefire-booter-2.7.2.jar:2.7.2]
19:08:07.087 TRACE com.test.TestService 34 exampleException - exit</pre></div>
<p>
Simply changing the root logger level to DEBUG in the example above will reduce the output
considerably.
</p>
<div><pre>
19:13:24.963 DEBUG com.test.TestService 32 exampleException - catching java.lang.ArrayIndexOutOfBoundsException: 3
at com.test.TestService.exampleException(TestService.java:29) [classes/:?]
at com.test.App.main(App.java:9) [classes/:?]
at com.test.AppTest.testApp(AppTest.java:15) [test-classes/:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.6.0_29]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) ~[?:1.6.0_29]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) ~[?:1.6.0_29]
at java.lang.reflect.Method.invoke(Method.java:597) ~[?:1.6.0_29]
at org.junit.internal.runners.TestMethodRunner.executeMethodBody(TestMethodRunner.java:99) [junit-4.3.1.jar:?]
at org.junit.internal.runners.TestMethodRunner.runUnprotected(TestMethodRunner.java:81) [junit-4.3.1.jar:?]
at org.junit.internal.runners.BeforeAndAfterRunner.runProtected(BeforeAndAfterRunner.java:34) [junit-4.3.1.jar:?]
at org.junit.internal.runners.TestMethodRunner.runMethod(TestMethodRunner.java:75) [junit-4.3.1.jar:?]
at org.junit.internal.runners.TestMethodRunner.run(TestMethodRunner.java:45) [junit-4.3.1.jar:?]
at org.junit.internal.runners.TestClassMethodsRunner.invokeTestMethod(TestClassMethodsRunner.java:66) [junit-4.3.1.jar:?]
at org.junit.internal.runners.TestClassMethodsRunner.run(TestClassMethodsRunner.java:35) [junit-4.3.1.jar:?]
at org.junit.internal.runners.TestClassRunner$1.runUnprotected(TestClassRunner.java:42) [junit-4.3.1.jar:?]
at org.junit.internal.runners.BeforeAndAfterRunner.runProtected(BeforeAndAfterRunner.java:34) [junit-4.3.1.jar:?]
at org.junit.internal.runners.TestClassRunner.run(TestClassRunner.java:52) [junit-4.3.1.jar:?]
at org.apache.maven.surefire.junit4.JUnit4TestSet.execute(JUnit4TestSet.java:35) [surefire-junit4-2.7.2.jar:2.7.2]
at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:115) [surefire-junit4-2.7.2.jar:2.7.2]
at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:97) [surefire-junit4-2.7.2.jar:2.7.2]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.6.0_29]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) ~[?:1.6.0_29]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) ~[?:1.6.0_29]
at java.lang.reflect.Method.invoke(Method.java:597) ~[?:1.6.0_29]
at org.apache.maven.surefire.booter.ProviderFactory$ClassLoaderProxy.invoke(ProviderFactory.java:103) [surefire-booter-2.7.2.jar:2.7.2]
at $Proxy0.invoke(Unknown Source) [?:?]
at org.apache.maven.surefire.booter.SurefireStarter.invokeProvider(SurefireStarter.java:150) [surefire-booter-2.7.2.jar:2.7.2]
at org.apache.maven.surefire.booter.SurefireStarter.runSuitesInProcess(SurefireStarter.java:91) [surefire-booter-2.7.2.jar:2.7.2]
at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:69) [surefire-booter-2.7.2.jar:2.7.2]</pre></div>
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