[logback-dev] Any chances that you would accept a pull request providing a solution to make Logback and Janino work together in an OSGi environment?
Christoph Zauner
chris.inbox.lists at NLLK.net
Tue Nov 17 12:28:12 UTC 2015
Hello,
As stated in http://logback.qos.ch/setup.html conditional processing in
configuration files requires the Janino library. When running in an OSGi
environment (e.g. an Eclipse RCP application) simply placing
commons-compiler.jar and janino.jar on your application's class path is not
sufficient enough. You will get the following exception:
<...>
12:50:47,754 |-INFO in ch.qos.logback.classic.joran.action.RootLoggerAction
- Setting level of ROOT logger to DEBUG
12:50:47,755 |-INFO in ch.qos.logback.core.joran.action.AppenderRefAction -
Attaching appender named [stdout] to Logger[ROOT]
12:50:47,755 |-INFO in ch.qos.logback.core.joran.action.AppenderRefAction -
Attaching appender named [file] to Logger[ROOT]
12:50:47,810 |-ERROR in ch.qos.logback.core.joran.conditional.IfAction -
Failed to parse condition [property("xxx.instance").equals("SIM_LOCAL")]
org.codehaus.janino.JaninoRuntimeException: Cannot load class
'ch.qos.logback.core.joran.conditional.PropertyWrapperForScripts' through
the parent loader
at org.codehaus.janino.JaninoRuntimeException: Cannot load class
'ch.qos.logback.core.joran.conditional.PropertyWrapperForScripts' through
the parent loader
at at
org.codehaus.janino.SimpleCompiler$1.getDelegate(SimpleCompiler.java:306)
at at
org.codehaus.janino.SimpleCompiler$1.accept(SimpleCompiler.java:291)
at at
org.codehaus.janino.UnitCompiler.getType(UnitCompiler.java:5159)
at at
org.codehaus.janino.UnitCompiler.access$16700(UnitCompiler.java:185)
at at
org.codehaus.janino.UnitCompiler$29.getSuperclass2(UnitCompiler.java:8154)
at at org.codehaus.janino.IClass.getSuperclass(IClass.java:406)
at at org.codehaus.janino.IClass.getIMethods(IClass.java:223)
at at org.codehaus.janino.IClass.getIMethods(IClass.java:199)
at at
org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:409)
at at
org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:393)
at at
org.codehaus.janino.UnitCompiler.access$400(UnitCompiler.java:185)
at at
org.codehaus.janino.UnitCompiler$2.visitPackageMemberClassDeclaration(UnitCompiler.java:347)
at at
org.codehaus.janino.Java$PackageMemberClassDeclaration.accept(Java.java:1139)
at at
org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:354)
at at
org.codehaus.janino.UnitCompiler.compileUnit(UnitCompiler.java:322)
at at
org.codehaus.janino.SimpleCompiler.compileToClassLoader(SimpleCompiler.java:383)
at at
org.codehaus.janino.ClassBodyEvaluator.compileToClass(ClassBodyEvaluator.java:315)
at at
org.codehaus.janino.ClassBodyEvaluator.cook(ClassBodyEvaluator.java:233)
at at
org.codehaus.janino.SimpleCompiler.cook(SimpleCompiler.java:192)
at at org.codehaus.commons.compiler.Cookable.cook(Cookable.java:84)
at at org.codehaus.commons.compiler.Cookable.cook(Cookable.java:77)
at at
ch.qos.logback.core.joran.conditional.PropertyEvalScriptBuilder.build(PropertyEvalScriptBuilder.java:51)
at at
ch.qos.logback.core.joran.conditional.IfAction.begin(IfAction.java:67)
at at
ch.qos.logback.core.joran.spi.Interpreter.callBeginAction(Interpreter.java:275)
at at
ch.qos.logback.core.joran.spi.Interpreter.startElement(Interpreter.java:147)
at at
ch.qos.logback.core.joran.spi.Interpreter.startElement(Interpreter.java:129)
at at
ch.qos.logback.core.joran.spi.EventPlayer.play(EventPlayer.java:50)
at at
ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:149)
at at
ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:135)
at at
ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:99)
at at
ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:49)
at at
ch.qos.logback.classic.util.ContextInitializer.configureByResource(ContextInitializer.java:77)
at at
ch.qos.logback.classic.util.ContextInitializer.autoConfig(ContextInitializer.java:152)
at at
org.slf4j.impl.StaticLoggerBinder.init(StaticLoggerBinder.java:85)
at at
org.slf4j.impl.StaticLoggerBinder.<clinit>(StaticLoggerBinder.java:55)
at at org.slf4j.LoggerFactory.bind(LoggerFactory.java:141)
at at
org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:120)
at at
org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:331)
at at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:283)
at at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:304)
at at
com.xxx.yyy.client.ui.lifecycle.StartHandler.<init>(StartHandler.java:22)
at at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method)
at at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at at
java.lang.reflect.Constructor.newInstance(Constructor.java:422)
at at
org.eclipse.e4.core.internal.di.ConstructorRequestor.execute(ConstructorRequestor.java:42)
at at
org.eclipse.e4.core.internal.di.InjectorImpl.internalMake(InjectorImpl.java:343)
at at
org.eclipse.e4.core.internal.di.InjectorImpl.make(InjectorImpl.java:264)
at at
org.eclipse.e4.core.contexts.ContextInjectionFactory.make(ContextInjectionFactory.java:162)
at at
org.eclipse.e4.ui.internal.workbench.ReflectionContributionFactory.createFromBundle(ReflectionContributionFactory.java:104)
at at
org.eclipse.e4.ui.internal.workbench.ReflectionContributionFactory.doCreate(ReflectionContributionFactory.java:73)
at at
org.eclipse.e4.ui.internal.workbench.ReflectionContributionFactory.create(ReflectionContributionFactory.java:55)
at at
org.eclipse.e4.ui.internal.workbench.swt.E4Application.createE4Workbench(E4Application.java:235)
at at
org.eclipse.e4.ui.internal.workbench.swt.E4Application.start(E4Application.java:145)
at at
org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at at
org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
at at
org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
at at
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:380)
at at
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:235)
at at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at at java.lang.reflect.Method.invoke(Method.java:497)
at at
org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:669)
at at org.eclipse.equinox.launcher.Main.basicRun(Main.java:608)
at at org.eclipse.equinox.launcher.Main.run(Main.java:1515)
at at org.eclipse.equinox.launcher.Main.main(Main.java:1488)
12:50:47,811 |-ERROR in ch.qos.logback.core.joran.conditional.IfAction -
Failed to determine "if then else" result
12:50:47,811 |-INFO in
ch.qos.logback.classic.joran.action.ConfigurationAction - End of
configuration.
<...>
This exception occurs because in an OSGi environment the class loader of
the org.cohehaus.janino bundle can not load classes from the
ch.qos.logback.core bundle. See http://moi.vonos.net/java/osgi-classloaders/
and
http://nstouchstones.blogspot.co.at/2010/07/class-loader-architecture-comparison.html
for a primer on OSGi class loading.
The org.cohehaus.janino bundle would need a "Require-Bundle:
ch.qos.logback.core" directive in it's manifest file in order for the
bundle class loader to be able to load classes from the ch.qos.logback.core
bundle. This can be achieved by extending the org.cohehaus.janino bundle
via a fragment (e.g. ch.qos.logback.core.janino.fragment). Below is the
manifest of the fragment:
Manifest-Version: 1.0
Bundle-ManifestVersion: 2
Bundle-Name: Janino Fragment (needed to uses Janino together with logback
in an OSGi environment)
Bundle-SymbolicName: ch.qos.logback.core.janino.fragment
Bundle-Version: 1.0.0
Fragment-Host: org.cohehaus.janino
Bundle-RequiredExecutionEnvironment: JavaSE-1.8
Require-Bundle: ch.qos.logback.core
Bundle-Vendor: Danube Development
I would like to ask if you would accept a pull request for
https://github.com/qos-ch/logback-contrib or
https://github.com/qos-ch/logback-extensions if I would prepare such a
fragment (named e.g. ch.qos.logback.core.janino.fragment).
- Chris
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