Hi guys
I am using weblogic 12.1.2 that uses a felix (standard shipped with oracle) so
that developers can embed osgi applications into a j2ee application.
So far, I am able to boot certain osgi bundles and activate them. However,
loading of the log4j infrastructure creates some struggle:
1) Either, the main bundle with its activator is not loaded due to missing
log4j jars (scope: provided)
2) Or the init of the log4j appenders fail because there are two log4j jars on
the classpath. However, the bundle is active but does not write logfiles, so
tracking errors is hard.
The question here is: How can I tell the osgi bundles to use the container
provided jar files instead of explicitly requesting the jars to be shipped with
the web application?
I already have tried to tell the application to prefer libraries that are
shipped with the app over the container libs, but this creates more issues than
it solves with other libraries (weblogic.xml):
<wls:container-descriptor>
<prefer-web-inf-classes>true</prefer-web-inf-classes>
</wls:container-descriptor>
So this is not a solution. Any idea appreciated!
Details:
1)
POM.xml:
========
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
<scope>provided</scope>
</dependency>
Error during starting of the main bundle:
==================================
Current bundle com.kuka.vms.server has state START_ACTIVATION_POLICY Failed:
org.osgi.framework.BundleException: Unresolved constraint in bundle
com.kuka.vms.server [85]: Unable to resolve 85.0: missing requirement [85.0]
osgi.wiring.package;
(&(osgi.wiring.package=com.kuka.nav.multicast)(version>=1.0.0)) [caused by:
Unable to resolve 44.0: missing requirement [44.0] osgi.wiring.package;
(&(osgi.wiring.package=com.kuka.util)(version>=2.0.0)) [caused by: Unable to
resolve 12.0: missing requirement [12.0] osgi.wiring.package;
(&(osgi.wiring.package=org.slf4j)(version>=1.7.0))]] at
org.apache.felix.framework.Felix.resolveBundleRevision(Felix.java:3826) at
org.apache.felix.framework.Felix.startBundle(Felix.java:1868) at
org.apache.felix.framework.BundleImpl.start(BundleImpl.java:944) at
org.apache.felix.framework.BundleImpl.start(BundleImpl.java:931) at
com.swisslog.wm6.test.TestServlet.processRequest(TestServlet.java:78) at
com.swisslog.wm6.test.TestServlet.doGet(TestServlet.java:276) at
javax.servlet.http.HttpServlet.service(HttpServlet.java:731) at
javax.servlet.http.HttpServlet.service(HttpServlet.java:844) at
weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:280)
at
weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:254)
at
weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:136)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:341)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:238)
at
weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3363)
at
weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3333)
at
weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
at weblogic.servlet.provider.WlsSubjectHandle.run(WlsSubjectHandle.java:57) at
weblogic.servlet.internal.WebAppServletContext.doSecuredExecute(WebAppServletContext.java:2220)
at
weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2146)
at
weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2124)
at
weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1564)
at
weblogic.servlet.provider.ContainerSupportProviderImpl$WlsRequestExecutor.run(ContainerSupportProviderImpl.java:254)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:295) at
weblogic.work.ExecuteThread.run(ExecuteThread.java:254)
2)
POM.xml (no scope any longer)
=========
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.0</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.0</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
Error during start of the main bundle:
===============================
java.lang.ClassCastException: org.apache.log4j.RollingFileAppender cannot be
cast to org.apache.log4j.Appender
at org.apache.log4j.xml.DOMConfigurator.parseAppender(DOMConfigurator.java:248)
at
org.apache.log4j.xml.DOMConfigurator.findAppenderByName(DOMConfigurator.java:176)
at
org.apache.log4j.xml.DOMConfigurator.findAppenderByReference(DOMConfigurator.java:191)
at
org.apache.log4j.xml.DOMConfigurator.parseChildrenOfLoggerElement(DOMConfigurator.java:523)
at org.apache.log4j.xml.DOMConfigurator.parseRoot(DOMConfigurator.java:492)
at org.apache.log4j.xml.DOMConfigurator.parse(DOMConfigurator.java:1006)
at org.apache.log4j.xml.DOMConfigurator.doConfigure(DOMConfigurator.java:872)
at org.apache.log4j.xml.DOMConfigurator.doConfigure(DOMConfigurator.java:778)
at org.apache.log4j.xml.DOMConfigurator.configure(DOMConfigurator.java:906)
at com.kuka.internal.VMSActivator.start(VMSActivator.java:41)
at
org.apache.felix.framework.util.SecureAction.startActivator(SecureAction.java:645)
at org.apache.felix.framework.Felix.activateBundle(Felix.java:1977)
at org.apache.felix.framework.Felix.startBundle(Felix.java:1895)
at org.apache.felix.framework.BundleImpl.start(BundleImpl.java:944)
at weblogic.osgi.internal.OSGiBundleImpl.start(OSGiBundleImpl.java:35)
[...]
log4j:ERROR Could not create an Appender. Reported error follows.
java.lang.ClassCastException: org.apache.log4j.ConsoleAppender cannot be cast
to org.apache.log4j.Appender
at org.apache.log4j.xml.DOMConfigurator.parseAppender(DOMConfigurator.java:248)
at
org.apache.log4j.xml.DOMConfigurator.findAppenderByName(DOMConfigurator.java:176)
at
org.apache.log4j.xml.DOMConfigurator.findAppenderByReference(DOMConfigurator.java:191)
at
org.apache.log4j.xml.DOMConfigurator.parseChildrenOfLoggerElement(DOMConfigurator.java:523)
at org.apache.log4j.xml.DOMConfigurator.parseRoot(DOMConfigurator.java:492)
at org.apache.log4j.xml.DOMConfigurator.parse(DOMConfigurator.java:1006)
at org.apache.log4j.xml.DOMConfigurator.doConfigure(DOMConfigurator.java:872)
at org.apache.log4j.xml.DOMConfigurator.doConfigure(DOMConfigurator.java:778)
at org.apache.log4j.xml.DOMConfigurator.configure(DOMConfigurator.java:906)
at com.kuka.internal.VMSActivator.start(VMSActivator.java:41)
at
org.apache.felix.framework.util.SecureAction.startActivator(SecureAction.java:645)
at org.apache.felix.framework.Felix.activateBundle(Felix.java:1977)
at org.apache.felix.framework.Felix.startBundle(Felix.java:1895)
at org.apache.felix.framework.BundleImpl.start(BundleImpl.java:944)
at weblogic.osgi.internal.OSGiBundleImpl.start(OSGiBundleImpl.java:35)
at
weblogic.osgi.internal.OSGiAppDeploymentExtension.startAll(OSGiAppDeploymentExtension.java:61)
at
weblogic.osgi.internal.OSGiAppDeploymentExtension.deployBundlesIntoFramework(OSGiAppDeploymentExtension.java:146)
at
weblogic.osgi.internal.OSGiAppDeploymentExtension.prepare(OSGiAppDeploymentExtension.java:229)
at
weblogic.application.internal.flow.AppDeploymentExtensionFlow.prepare(AppDeploymentExtensionFlow.java:23)
[...]
Thanks,
Remo
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