2:37 p.m.
NullPointerException occurs in MainDeployer.listDeployedModules() when there is a module
with no associated deployer
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Key: JBAS-5983
URL: https://jira.jboss.org/jira/browse/JBAS-5983
Project: JBoss Application Server
Issue Type: Bug
Security Level: Public (Everyone can see)
Components: Deployers
Affects Versions: JBossAS-4.2.3.GA, JBossAS-4.2.2.GA, JBossAS-4.2.1.GA
Reporter: Ian Springer
Assignee: Ales Justin
Priority: Critical
To reproduce this, drop an empty file named foo.xml somewhere under the deploy dir (I
dropped mine under an exploded ear, but I don't think it matters if it's under an
ear). The file will fail to deploy, but a DeploymentInfo will still be created for it,
e.g.:
[org.jboss.deployment.DeploymentInfo@ee0f6e74 {
url=file:/C:/Projects/rhq-trunk/dev-container/jbossas/server/default/deploy/rhq.ear/rhq-downloads/rhq-plugins/foo.xml
}
deployer: null
status: null
state: INIT_WAITING_DEPLOYER
watch:
file:/C:/Projects/rhq-trunk/dev-container/jbossas/server/default/deploy/rhq.ear/rhq-downloads/rhq-plugins/foo.xml
altDD: null
lastDeployed: 1222197704045
lastModified: 1222197704045
mbeans:
]
Now go the MainDeployer MBean in the jmx-console and try to invoke the
listDeployedModules() operation. You should get the following exception:
javax.management.RuntimeMBeanException
org.jboss.mx.interceptor.ReflectedDispatcher.handleInvocationExceptions(ReflectedDispatcher.java:176)
org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:163)
org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:133)
org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:142)
org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
org.jboss.jmx.adaptor.control.Server.invokeOpByName(Server.java:258)
org.jboss.jmx.adaptor.control.Server.invokeOp(Server.java:223)
org.jboss.jmx.adaptor.html.HtmlAdaptorServlet.invokeOp(HtmlAdaptorServlet.java:262)
org.jboss.jmx.adaptor.html.HtmlAdaptorServlet.processRequest(HtmlAdaptorServlet.java:100)
org.jboss.jmx.adaptor.html.HtmlAdaptorServlet.doPost(HtmlAdaptorServlet.java:82)
javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.rhq.helpers.rtfilter.filter.RtFilter.doFilter(RtFilter.java:113)
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
root cause
java.lang.NullPointerException
org.jboss.deployment.SerializableDeploymentInfo.<init>(SerializableDeploymentInfo.java:102)
org.jboss.deployment.MainDeployer.listDeployedModules(MainDeployer.java:261)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:133)
org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:142)
org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
org.jboss.jmx.adaptor.control.Server.invokeOpByName(Server.java:258)
org.jboss.jmx.adaptor.control.Server.invokeOp(Server.java:223)
org.jboss.jmx.adaptor.html.HtmlAdaptorServlet.invokeOp(HtmlAdaptorServlet.java:262)
org.jboss.jmx.adaptor.html.HtmlAdaptorServlet.processRequest(HtmlAdaptorServlet.java:100)
org.jboss.jmx.adaptor.html.HtmlAdaptorServlet.doPost(HtmlAdaptorServlet.java:82)
javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.rhq.helpers.rtfilter.filter.RtFilter.doFilter(RtFilter.java:113)
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
The NPE occurs on the following line in the constructor of SerializableDeploymentInfo:
this.deployer = info.deployer.getServiceName();
because info.deployer is null.
I think the fix is changing the line to:
this.deployer = (info.deployer != null) ? info.deployer.getServiceName() : null;
This is an important fix for JON, because the listDeployedModules() JMX operation is
relied on for EAR/WAR discovery.
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