On one of our services, we see the following errors in stderr and communications stop after that.
java.lang.UnsatisfiedLinkError: no net in java.library.path
java.lang.NoClassDefFoundError: Could not initialize class sun.nio.ch.SocketChannelImpl$DefaultOptionsHolder
They go away when the service is restarted, but recur after several hours! What could be causing this?
We're running Oracle's server-jre and I verified that rt.jar contains the class in the error. I have also confirmed that no changes were made to JRE, while the service was running.
NoClassDefFoundError either means the class could not be found, or the class was found and loaded but the static initializer failed when it was called. Your error messages indicate the latter: the class was found, but static initialization failed. There is typically a "Caused by" in this case with the error, and given that you included the UnsatisfiedLinkError, I suspect this is the cause of the problem. As for why that happened, I don't know; it looks like your JRE is corrupt if it was unable to find an internal native library.
Related
I'm running Cassandra 2.2.11 (and won't be upgrading) on a host. Periodically, in a cron job, I run nodetool commands for monitoring. nodetool is implemented as just another java process that uses JMX to talk to the Cassandra java process. I launch five or so commands every minute.
Once in a while (not in any recognizable pattern), the execution of nodetool will fail with a NoClassDefFoundError that refers to a class from java.lang. For example,
java.lang.NoClassDefFoundError: java/lang/Thread (wrong name: java/lang/Thread)
at java.lang.Class.getDeclaredFields0(Native Method)
at java.lang.Class.privateGetDeclaredFields(Class.java:2583)
at java.lang.Class.getDeclaredField(Class.java:2068)
at java.util.concurrent.FutureTask.<clinit>(FutureTask.java:476)
at java.util.concurrent.ScheduledThreadPoolExecutor.scheduleWithFixedDelay(ScheduledThreadPoolExecutor.java:590)
at sun.rmi.transport.tcp.TCPChannel.free(TCPChannel.java:347)
at sun.rmi.server.UnicastRef.free(UnicastRef.java:431)
at sun.rmi.server.UnicastRef.done(UnicastRef.java:448)
at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)
at com.sun.jndi.rmi.registry.RegistryContext.lookup(RegistryContext.java:132)
at com.sun.jndi.toolkit.url.GenericURLContext.lookup(GenericURLContext.java:205)
at javax.naming.InitialContext.lookup(InitialContext.java:417)
at javax.management.remote.rmi.RMIConnector.findRMIServerJNDI(RMIConnector.java:1955)
at javax.management.remote.rmi.RMIConnector.findRMIServer(RMIConnector.java:1922)
at javax.management.remote.rmi.RMIConnector.connect(RMIConnector.java:287)
at javax.management.remote.JMXConnectorFactory.connect(JMXConnectorFactory.java:270)
at org.apache.cassandra.tools.NodeProbe.connect(NodeProbe.java:183)
at org.apache.cassandra.tools.NodeProbe.<init>(NodeProbe.java:150)
at org.apache.cassandra.tools.NodeTool$NodeToolCmd.connect(NodeTool.java:302)
at org.apache.cassandra.tools.NodeTool$NodeToolCmd.run(NodeTool.java:242)
at org.apache.cassandra.tools.NodeTool.main(NodeTool.java:158)
In this stack trace, the error happens during class initialization for FutureTask. I've also seen
java.lang.NoClassDefFoundError: java/lang/Object (wrong name: java/lang/Object)
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
at java.lang.Class.getDeclaredMethod(Class.java:2128)
at java.lang.invoke.MethodHandleImpl$Lazy.<clinit>(MethodHandleImpl.java:614)
[...]
but also
java.lang.NoClassDefFoundError: java/lang/String (wrong name: java/lang/String)
at java.lang.Class.getDeclaredFields0(Native Method)
at java.lang.Class.privateGetDeclaredFields(Class.java:2583)
at java.lang.Class.getDeclaredField(Class.java:2068)
at java.io.ObjectStreamClass.getDeclaredSUID(ObjectStreamClass.java:1703)
at java.io.ObjectStreamClass.access$700(ObjectStreamClass.java:72)
at java.io.ObjectStreamClass$2.run(ObjectStreamClass.java:484)
at java.io.ObjectStreamClass$2.run(ObjectStreamClass.java:472)
[...]
So it's not only happening during class initialization, but, in the few samples I've collected, something in the reflection implementation does seem to be the culprit.
Java is at version 8
java version "1.8.0_144"
The nodetool launcher always uses the same classpath. And there are no weird classes in there (or additional class loaders). The same installation is done across hundreds of identical nodes (on Linux).
My top search results for NoClassDefFoundError wrong name refer to executions where a simplified class name was used to launch java, rather than the fully qualified name. That's not the issue here. Also, the names in the error messages are identical.
So what can cause such "wrong name" NoClassDefFoundError errors for "bootstrap" classes?
i think it is the lack of resource that cause the problems like the connector timeout or something. Do you see the log from your example?;
nodeprobe is connecting through the jmx or trying to connect then the error occurs?
Those are very typical error that can also cause other intermiten error on the shit.(usually OS/netowrk OS shit) thus :
includes your string and even object based error ;in conclusion it make sense.
may be you should check your resource when the error happen.
i know this is kind of catch 22 that the resource monitor is causing the lack of resource instead; but it happen hehe
According to the stacktraces, the exception id being thrown in a calls to getDeclaredFields0. However, this is not where the exception came from originally. According to the OpenJDK source code, there is nothing in the codebase that throws an exception with "wrong name" in the exception message. The message has come from somewhere else.
I strongly suspect that this is actually re-reporting a problem that happened the first time that some class was loaded or initialized. What happens is that the classloader finds the problem the first time, marks the offending internal class object as "bad" and then the throws the error. According to the javadoc, applications should not attempt to recover from this. But if one does, and then attempts to use the "bad" class in some way, the original problem will be reported again as a NoClassDefFoundError with the original reason.
So what does the reason mean?
It is hard to tell because we don't have the stacktrace for the original exception; i.e. then one where the classloading / initialization first failed. If you can find that stacktrace, we can track down the 3rd-party library that did it. It is almost certainly happening in a classloader.
The obvious meaning is that a class file has a classname in it that doesn't match the name in the classes bytecodes. However, we'd need to examine the classloader code to be sure.
So why is it happening intermittently?
Possibly because the application JVM has many classloaders and only a subset of them have "polluted" their class namespace with this bad class.
That could be bad news. It suggests there may be some kind of synchronization issue in the core of the application.
Anyhow, there is not enough evidence to draw sound conclusions.
Bottom line
Based on the evidence, I would guess that this is a result of some kind of "code weaving" or "byte code engineering" that has gone wrong. As a further guess, I would say that some child classloader is not delegating properly, and has mistakenly attempted to process a built-in class. (It could even be that the classloader in question knows that it should never process a "java.lang.*" class and it has a obscure way of saying this.)
Why? possibly because someone / something explicitly added the "rt.jar" to some classpath that it shouldn't be on.
For further diagnosis, the first thing we need is the original stacktrace that tells us which classloader did the initial damage.
As none of basic java library found,I think there is problem in your java installation or you have not set CLASSPATH and JAVA_HOME environment variables. Try to set CLASSPATH and JAVA_HOME environment variables.
export JAVA_HOME="/usr/lib/jvm/java-8-oracle/bin"
export CLASSPATH="/usr/lib/jvm/java-8-oracle/lib"
If not worked, try reinstall java and set environment variables.
I get the following exception when calling Unsafe.putInt:
A needed class was not found. This could be due to an error in your runpath. Missing class: java/lang/InvalidClassException
java.lang.NoClassDefFoundError: java/lang/InvalidClassException
Unsafe lives in rt.jar, but I am unable to find java/lang/InvalidClassException, only java.io.InvalidClassException.
How do I resolve this exception? (if it matters, I'm using jdk 1.7u55)
Thank you for any help.
Update: this is caused by a call to the native method unsafe.arrayBaseOffset. I can work around it by using the static variables: ARRAY_?_BASE_OFFSET, but I don't know why.
We have WAS 6.0 (I know) .2.43 ND running in multiple regions.
Our Dev-B region runs fine, but Dev-C throws a java exception when we make web-calls (at least this is what the developer tells me)...Same code in both regions and I checked the obvious suspects (Global security, SSL ciphers etc) and they all seem to match. Here's the stack trace from SystemErr:
[8/1/12 4:02:31:758 EDT] 0000005c ServletWrappe E SRVE0068E: Could not invoke the service() method on servlet action. Exception thrown : java.lang.NoClassDefFoundError
at javax.crypto.Mac.getInstance(DashoA12275)
at net.oauth.signature.HMAC_SHA1.computeSignature(HMAC_SHA1.java:73)
at net.oauth.signature.HMAC_SHA1.getSignature(HMAC_SHA1.java:39)
at net.oauth.signature.OAuthSignatureMethod.getSignature(OAuthSignatureMethod.java:83)
at net.oauth.signature.OAuthSignatureMethod.sign(OAuthSignatureMethod.java:54)
at com.harcourt.hsp.utils.LTIUtil.generateSignature(LTIUtil.java:62)
at com.harcourt.hsp.web.struts.lti.action.BaseLTIAction.generateSignature(BaseLTIAction.java:238)
at com.harcourt.hsp.web.struts.lti.action.BaseLTIAction.execute(BaseLTIAction.java:96)
at org.springframework.web.struts.DelegatingActionProxy.execute(DelegatingActionProxy.java:106)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:419)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:743)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1796)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:887)
at com.ibm.ws.webcontainer.servlet.CacheServletWrapper.handleRequest(CacheServletWrapper.java:90)
at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:1937)
at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:130)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:434)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewInformation(HttpInboundLink.java:373)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.ready(HttpInboundLink.java:253)
at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.sendToDiscriminaters(NewConnectionInitialReadCallback.java:207)
at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.complete(NewConnectionInitialReadCallback.java:109)
at com.ibm.ws.tcp.channel.impl.WorkQueueManager.requestComplete(WorkQueueManager.java:566)
at com.ibm.ws.tcp.channel.impl.WorkQueueManager.attemptIO(WorkQueueManager.java:619)
at com.ibm.ws.tcp.channel.impl.WorkQueueManager.workerRun(WorkQueueManager.java:952)
at com.ibm.ws.tcp.channel.impl.WorkQueueManager$Worker.run(WorkQueueManager.java:1039)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1498)
at javax.crypto.Mac.getInstance(DashoA12275)
at net.oauth.signature.HMAC_SHA1.computeSignature(HMAC_SHA1.java:73)
at net.oauth.signature.HMAC_SHA1.getSignature(HMAC_SHA1.java:39)
at net.oauth.signature.OAuthSignatureMethod.getSignature(OAuthSignatureMethod.java:83)
at net.oauth.signature.OAuthSignatureMethod.sign(OAuthSignatureMethod.java:54)
at com.harcourt.hsp.utils.LTIUtil.generateSignature(LTIUtil.java:62)
at com.harcourt.hsp.web.struts.lti.action.BaseLTIAction.generateSignature(BaseLTIAction.java:238)
at com.harcourt.hsp.web.struts.lti.action.BaseLTIAction.execute(BaseLTIAction.java:96)
at org.springframework.web.struts.DelegatingActionProxy.execute(DelegatingActionProxy.java:106)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:419)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:743)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1796)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:887)
at com.ibm.ws.webcontainer.servlet.CacheServletWrapper.handleRequest(CacheServletWrapper.java:90)
at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:1937)
at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:130)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:434)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewInformation(HttpInboundLink.java:373)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.ready(HttpInboundLink.java:253)
at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.sendToDiscriminaters(NewConnectionInitialReadCallback.java:207)
at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.complete(NewConnectionInitialReadCallback.java:109)
at com.ibm.ws.tcp.channel.impl.WorkQueueManager.requestComplete(WorkQueueManager.java:566)
at com.ibm.ws.tcp.channel.impl.WorkQueueManager.attemptIO(WorkQueueManager.java:619)
at com.ibm.ws.tcp.channel.impl.WorkQueueManager.workerRun(WorkQueueManager.java:952)
at com.ibm.ws.tcp.channel.impl.WorkQueueManager$Worker.run(WorkQueueManager.java:1039)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1498)
Thanks for your help. I'm sure it's a config that I'm missing.
For some reason, javax.crypto.Mac.getInstance is not able to be resolved. If you want to try some low-hanging fruit before full blown troubleshooting: Are you missing a jar? Does the class need to be added to your classpath?
Ultimately, the best way to resolve the issue is a logical step by step analysis. This 3 part article will walk you through troubleshooting the java.lang.NoClassDefFoundError. It's a relatively short read that I suspect will probably answer your question.
For completeness, I've included the short version (pulled from the articles mentioned above):
Review the java.lang.NoClassDefFoundError error and identify the
missing Java class. (In this case javax.crypto.Mac.getInstance)
Verify and locate the missing Java class from your compile / build
environment
Determine if the missing Java class is from your application code,
third part API or even the Java EE container itself. Verify where
the missing JAR file(s) is / are expected to be found
Once found, verify your runtime environment Java classpath for any
typo or missing JAR file(s)
If the problem is triggered from a Java EE application, perform the
same above steps but verify the packaging of your EAR / WAR file for
missing JAR and other library file dependencies such as MANIFEST
Perform a code walkthrough of the affected class and determine if it
contains static initializer code (variables & static block)
Review your server and application logs and determine if any error
originates from the static initializer code
Once confirmed, analyze the code further and determine the root
cause of the initializer code failure. You may need to add some
extra logging along with proper error handling to prevent and better
handle future failures of your static initializer code going forward
We have coded and run a dynamic web application using MAPSERVER(Version 6.0.1) on windows platform using Java Technology. Now, there is need of deploying it on Ubuntu 11.10. We have installed Apache Tomcat 6.0, Mapserver 6.0.1, Apache 2.0, and FWTools-2.0.1(As this package contain all required tools for mapserver if I am not wrong, so I didn't feel any other tools to be installed). We have deployed the war file(and put application without) in Apache Tomcat 's Webapps folder. I even got the index page which dont have code related with mapscript api. But while fetching the other servlet with mapscript we are getting following error...
java.lang.UnsatisfiedLinkError: no mapscript in java.library.path
java.lang.ClassLoader.loadLibrary(ClassLoader.java:1681)
java.lang.Runtime.loadLibrary0(Runtime.java:840)
java.lang.System.loadLibrary(System.java:1047)
edu.umn.gis.mapscript.mapscriptJNI.<clinit>(mapscriptJNI.java:23)
edu.umn.gis.mapscript.mapObj.<init>(mapObj.java:283)
Again while refreshing the browser page where the above error was displayed, I got a change,
java.lang.NoClassDefFoundError: Could not initialize class
edu.umn.gis.mapscript.mapscriptJNI
edu.umn.gis.mapscript.mapObj.<init>(mapObj.java:283)
I searched on net about the above problem. But finally blank. Please, provide idea about the above problem.
I'm not going to explain why you're getting the UnsatisfiedLinkError, but instead I'll explain why you are getting the NoClassDefFoundError when you reload the page.
A NoClassDefFoundError with a message Could not initialize class ... is thrown by the JVM when it attempts to initialize a class that it has already tried and failed to initialize.
The first of your two stacktraces contains the line
edu.umn.gis.mapscript.mapscriptJNI.<clinit>(mapscriptJNI.java:23)
The method name <clinit> denotes the static initializer, of the class mapscriptJNI. So, at the point that the UnsatisfiedLinkError was thrown, the JVM was trying to initialize this class. Looking at the error message, it seems that this static initializer tried to load the native code library mapscript but failed.
This UnsatisfiedLinkError causes the mapscriptJNI class to fail to initialize successfully. The JVM keeps a record of all classes that fail to initialize, and if you attempt to initialize one of those classes again, you'll get a NoClassDefFoundError with a message saying that it could not initialize that class.
When you refresh the page, you end up causing the JVM to attempt to initialize the class mapscriptJNI a second time. Of course, this class failed to initialize the previous time. Your second stacktrace contains exactly the error I've described.
In short, the UnsatisfiedLinkError is the real error here. Fix that and the other one will go away.
I would check the following 2 items:
Is the mapscript.jar file on Tomcat or at least your webapp's classpath? (NoClassDefFoundError is your big clue here)
Is the libmapscript.so on either your LD_LIBRARY_PATH or -Djava.library.path? (UnsatisfiedLinkError since the shared object cannot be found)
Try having a look at this post, near the Running Java Mapscript (on Linux) section.
Hope that helps!
In Eclipse I get this eror:
Exception in thread "main"
java.lang.UnsatisfiedLinkError:
com.nokia.mid.impl.isa.util.SharedObjects.nativeSetTable(Ljava/util/Hashtable;)Ljava/util/Hashtable;
I can see SharedObjects, but nativeSetTable doesn't seem to be a method. It might however be hidden -> I don't have access to the source code.
This was my code:
connection = (HttpConnection)Connector.open(this.url);
This is the trace:
Exception in thread "main" java.lang.UnsatisfiedLinkError:
com.nokia.mid.impl.isa.util.SharedObjects.nativeSetTable(Ljava/util/Hashtable;)Ljava/util/Hashtable;
at
com.nokia.mid.impl.isa.util.SharedObjects.nativeSetTable(Native
Method) at
com.nokia.mid.impl.isa.util.SharedObjects.createTable(SharedObjects.java:465)
at
com.nokia.mid.impl.isa.util.SharedObjects.(SharedObjects.java:181)
at
com.nokia.mid.impl.isa.io.GeneralSharedIO.(GeneralSharedIO.java:67)
at
com.sun.midp.io.ConnectionBaseAdapter.checkForPermission(ConnectionBaseAdapter.java:236)
at
com.sun.midp.io.ConnectionBaseAdapter.openPrim(ConnectionBaseAdapter.java:205)
at
com.sun.midp.io.ConnectionBaseAdapter.openPrim(ConnectionBaseAdapter.java:178)
at
com.sun.midp.io.InternalConnector.openPrim(InternalConnector.java:254)
at
com.sun.midp.io.InternalConnector.open(InternalConnector.java:153)
at
javax.microedition.io.Connector.open(Connector.java:138)
at
javax.microedition.io.Connector.open(Connector.java:120)
at
javax.microedition.io.Connector.open(Connector.java:104)
I think that nativeSetTable() is protected or private, that's why you don't see it. And moreover nativeSetTable() is a native method, which means that it is based on native code (already compiled for a specific processor and available in a specific lib [ie. a DLL]).
UnsatisfiedLinkError means that this particular method couldn't be retrieved and executed properly.
Thrown if the Java Virtual Machine cannot find an appropriate native-language definition of a method declared native.
This means that your Java ME emulator must have missing librairies. You should try to reinstall it.
Resources :
Javadoc - UnsatisfiedLinkError
I guess you are coupling your source code with the wrong version of the nokia mid library.
It could be that your runtime classpath is using a different version of the jar where SharedObjects lives, when compared to your compile-time classpath in Eclipse. I would double-check your classpath settings.
Ok, I found one reason:
I created a test class in java to test my code, just a plain java file (with main method). And I ran it as a plain java application. Then, it doesn't work. But after I tried it in a Midlet, I didn't get the error!