jboss-libra's Introduction

Libra

Libra provides the means to weigh your Objects.

API

long myObjectSize = Libra.getObjectSize("Hello world");

That's it. No more.

Bootstrapping

There are two ways to boot up Libra.

Java Agent

java -javaagent:jboss-libra.jar MyMain

Libra will be initialized through the Java Agent mechanism.

tools.jar

java -cp $JAVA_HOME/lib/tools.jar MyMain

Libra will initialize itself through the Attach API.

Usage in AS 7

For usage in AS 7 please refer to How-To: use Libra in AS 7.

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jboss-libra's Issues

java.lang.ClassNotFoundException: org.jboss.libra.LibraException in AS 7

When trying to use Libra within a deployment, the deployment will fail as follows:

12:42:00,380 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-14) MSC00001: Failed to start service jboss.deployment.unit."remote-ejb-distinct-name-jar-test-case.jar".POST_MODULE: org.jboss.msc.service.StartException in service jboss.deployment.unit."remote-ejb-distinct-name-jar-test-case.jar".POST_MODULE: JBAS018733: Failed to process phase POST_MODULE of deployment "remote-ejb-distinct-name-jar-test-case.jar"
    at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:123) [jboss-as-server-7.2.0.Alpha1-SNAPSHOT.jar:7.2.0.Alpha1-SNAPSHOT]
    at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1811) [jboss-msc-1.0.2.GA.jar:1.0.2.GA]
    at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1746) [jboss-msc-1.0.2.GA.jar:1.0.2.GA]
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [rt.jar:1.6.0_26]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [rt.jar:1.6.0_26]
    at java.lang.Thread.run(Thread.java:662) [rt.jar:1.6.0_26]
Caused by: java.lang.RuntimeException: JBAS018757: Error getting reflective information for class org.jboss.as.test.integration.ejb.remote.distinctname.StatelessEcho with ClassLoader ModuleClassLoader for Module "deployment.remote-ejb-distinct-name-jar-test-case.jar:main" from Service Module Loader
    at org.jboss.as.server.deployment.reflect.DeploymentReflectionIndex.getClassIndex(DeploymentReflectionIndex.java:72) [jboss-as-server-7.2.0.Alpha1-SNAPSHOT.jar:7.2.0.Alpha1-SNAPSHOT]
    at org.jboss.as.ee.metadata.MethodAnnotationAggregator.runtimeAnnotationInformation(MethodAnnotationAggregator.java:58)
    at org.jboss.as.ee.component.deployers.InterceptorAnnotationProcessor.handleAnnotations(InterceptorAnnotationProcessor.java:85)
    at org.jboss.as.ee.component.deployers.InterceptorAnnotationProcessor.processComponentConfig(InterceptorAnnotationProcessor.java:70)
    at org.jboss.as.ee.component.deployers.InterceptorAnnotationProcessor.deploy(InterceptorAnnotationProcessor.java:55)
    at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:116) [jboss-as-server-7.2.0.Alpha1-SNAPSHOT.jar:7.2.0.Alpha1-SNAPSHOT]
    ... 5 more
Caused by: java.lang.NoClassDefFoundError: org/jboss/libra/LibraException
    at java.lang.Class.getDeclaredFields0(Native Method) [rt.jar:1.6.0_26]
    at java.lang.Class.privateGetDeclaredFields(Class.java:2291) [rt.jar:1.6.0_26]
    at java.lang.Class.getDeclaredFields(Class.java:1743) [rt.jar:1.6.0_26]
    at org.jboss.as.server.deployment.reflect.ClassReflectionIndex.<init>(ClassReflectionIndex.java:57) [jboss-as-server-7.2.0.Alpha1-SNAPSHOT.jar:7.2.0.Alpha1-SNAPSHOT]
    at org.jboss.as.server.deployment.reflect.DeploymentReflectionIndex.getClassIndex(DeploymentReflectionIndex.java:68) [jboss-as-server-7.2.0.Alpha1-SNAPSHOT.jar:7.2.0.Alpha1-SNAPSHOT]
    ... 10 more
Caused by: java.lang.ClassNotFoundException: org.jboss.libra.LibraException
    at java.net.URLClassLoader$1.run(URLClassLoader.java:202) [rt.jar:1.6.0_26]
    at java.security.AccessController.doPrivileged(Native Method) [rt.jar:1.6.0_26]
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190) [rt.jar:1.6.0_26]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306) [rt.jar:1.6.0_26]
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) [rt.jar:1.6.0_26]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247) [rt.jar:1.6.0_26]
    at org.jboss.modules.ConcurrentClassLoader.performLoadClass(ConcurrentClassLoader.java:395) [jboss-modules.jar:1.1.2.GA]
    at org.jboss.modules.ConcurrentClassLoader.loadClass(ConcurrentClassLoader.java:120) [jboss-modules.jar:1.1.2.GA]
    ... 15 more

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