IllegalAccessError in Solr 3.6.1

[nolanlawson]

My writeup of the problem:

It looks like in Solr 3.5.0, ExtendedDismaxQParserPlugin defines "queryFields" to be package-private, whereas in Solr 3.6.1, it becomes private. So my code fails because I try to access the superclass's "queryFields" (here).

One user's report on the problem:

My environment :
JAVA : java version “1.6.0_18″ (OpenJDK Runtime Environment (IcedTea6 1.8.7) (6b18-1.8.7-2~squeeze1))
TOMCAT : 7.0.23
SOLR : 3.6.1
I then added the tag metadata in the /opt/tomcat-master-dev/conf/web.xml file :
The full Java stack Trace :
11 déc. 2012 08:54:31 org.apache.solr.common.SolrException log
GRAVE: java.lang.IllegalAccessError: class org.apache.solr.search.SynonymExpandingExtendedDismaxQParser cannot access its superclass org.apache.solr.search.ExtendedDismaxQParser
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:634)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:277)
at java.net.URLClassLoader.access$000(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:212)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
at java.net.FactoryURLClassLoader.loadClass(URLClassLoader.java:615)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:334)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:388)
at org.apache.solr.core.SolrCore.createInstance(SolrCore.java:419)
at org.apache.solr.core.SolrCore.createInitInstance(SolrCore.java:441)
at org.apache.solr.core.SolrCore.initPlugins(SolrCore.java:1612)
at org.apache.solr.core.SolrCore.initPlugins(SolrCore.java:1606)
at org.apache.solr.core.SolrCore.initPlugins(SolrCore.java:1639)
at org.apache.solr.core.SolrCore.initQParsers(SolrCore.java:1556)
at org.apache.solr.core.SolrCore.(SolrCore.java:555)
at org.apache.solr.core.CoreContainer.create(CoreContainer.java:480)
at org.apache.solr.core.CoreContainer.load(CoreContainer.java:332)
at org.apache.solr.core.CoreContainer.load(CoreContainer.java:216)
at org.apache.solr.core.CoreContainer$Initializer.initialize(CoreContainer.java:161)
at org.apache.solr.servlet.SolrDispatchFilter.init(SolrDispatchFilter.java:96)
at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:277)
at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:258)
at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:382)
at org.apache.catalina.core.ApplicationFilterConfig.(ApplicationFilterConfig.java:103)
at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4624)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5281)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:866)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:842)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:615)
at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:649)
at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1581)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:636)
The problem is still there…

[nolanlawson]

Curiouser and curiouser. When I try to compile it for Solr 3.6.1, I see a totally different error message:

SEVERE: org.apache.solr.common.SolrException: Error Instantiating QParserPlugin, solr.SynonymExpandingExtendedDismaxQParserPlugin is not a org.apache.solr.search.QParserPlugin
    at org.apache.solr.core.SolrCore.createInstance(SolrCore.java:421)
    at org.apache.solr.core.SolrCore.createInitInstance(SolrCore.java:441)
    at org.apache.solr.core.SolrCore.initPlugins(SolrCore.java:1612)
    at org.apache.solr.core.SolrCore.initPlugins(SolrCore.java:1606)
    at org.apache.solr.core.SolrCore.initPlugins(SolrCore.java:1639)
    at org.apache.solr.core.SolrCore.initQParsers(SolrCore.java:1556)
    at org.apache.solr.core.SolrCore.<init>(SolrCore.java:555)
    at org.apache.solr.core.CoreContainer.create(CoreContainer.java:480)
    at org.apache.solr.core.CoreContainer.load(CoreContainer.java:332)
    at org.apache.solr.core.CoreContainer.load(CoreContainer.java:216)
    at org.apache.solr.core.CoreContainer$Initializer.initialize(CoreContainer.java:161)
    at org.apache.solr.servlet.SolrDispatchFilter.init(SolrDispatchFilter.java:96)
    at org.mortbay.jetty.servlet.FilterHolder.doStart(FilterHolder.java:97)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:713)
    at org.mortbay.jetty.servlet.Context.startContext(Context.java:140)
    at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1282)
    at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:518)
    at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:499)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:152)
    at org.mortbay.jetty.handler.ContextHandlerCollection.doStart(ContextHandlerCollection.java:156)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:152)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
    at org.mortbay.jetty.Server.doStart(Server.java:224)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at org.mortbay.xml.XmlConfiguration.main(XmlConfiguration.java:985)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.mortbay.start.Main.invokeMain(Main.java:194)
    at org.mortbay.start.Main.start(Main.java:534)
    at org.mortbay.start.Main.start(Main.java:441)
    at org.mortbay.start.Main.main(Main.java:119)

...which makes no sense, because I definitely extend that class in the class declaration. Maybe it has something to do with how the jar files are compiled.