i'm using cassandra 1.2.8 in ubuntu 12.4.
i used snapshot command already and backing up process was ok!
but now when i use this command i get error like below:
Exception in thread "main" FSWriteError in /var/lib/cassandra/data/english/word_doc /snapshots/1393155090911/english-word_doc-ic-10-Index.db
at org.apache.cassandra.io.util.FileUtils.createHardLink(FileUtils.java:80)
at org.apache.cassandra.io.sstable.SSTableReader.createLinks(SSTableReader.java:1063)
at org.apache.cassandra.db.ColumnFamilyStore.snapshotWithoutFlush(ColumnFamilyStore.java:1566)
at org.apache.cassandra.db.ColumnFamilyStore.snapshot(ColumnFamilyStore.java:1611)
at org.apache.cassandra.db.Table.snapshot(Table.java:194)
at org.apache.cassandra.service.StorageService.takeSnapshot(StorageService.java:2205)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:74)
at sun.reflect.GeneratedMethodAccessor7.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:277)
at com.sun.jmx.mbeanserver.StandardMBeanIntrospector.invokeM2(StandardMBeanIntrospector.java:112)
at com.sun.jmx.mbeanserver.StandardMBeanIntrospector.invokeM2(StandardMBeanIntrospector.java:46)
at com.sun.jmx.mbeanserver.MBeanIntrospector.invokeM(MBeanIntrospector.java:226)
at com.sun.jmx.mbeanserver.PerInterface.invoke(PerInterface.java:138)
at com.sun.jmx.mbeanserver.MBeanSupport.invoke(MBeanSupport.java:253)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:856)
at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:805)
at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1476)
at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:98)
at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1317)
at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1409)
at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:839)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:322)
at sun.rmi.transport.Transport$1.run(Transport.java:177)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:173)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:553)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:808)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:667)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1146)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:679)
Caused by: java.io.IOException: Unable to create hard link from /var/lib/cassandra/data/english/word_doc/english-word_doc-ic-10-Index.db to /var/lib/cassandra/data/english/word_doc/snapshots/1393155090911/english-word_doc-ic-10-Index.db (errno 1)
at org.apache.cassandra.utils.CLibrary.createHardLink(CLibrary.java:174)
at org.apache.cassandra.io.util.FileUtils.createHardLink(FileUtils.java:76)
... 40 more
note: my current data base is a back up version that i restore in my cassandra!
thanks for your help :)
edit: i have two keyspace,A and B. B is a back up version that i restore and store more data on it, but A is not. i can create back up from A with out any problem,but for B i get above error!
this seems to be an ubuntu 12.04 security issue on hard-links.
use this command to disable that:
sudo sysctl -w kernel.yama.protected_nonaccess_hardlinks=0
and after restore, reset it to its original value:
sudo sysctl -w kernel.yama.protected_nonaccess_hardlinks=1
After struggling with this issue again I found that I had a few root-owned files inside /var/lib/cassandra/data/.../etcetera, which triggered the hard link access restriction.
Recursively chowning all directories and files inside /var/lib/cassandra/data solved the problem.
Related
Groovy version:
Groovy Version: 3.0.0-rc-3 JVM: 1.8.0_221 Vendor: Oracle Corporation OS: Linux
on running command : groovysh
Error output:
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.codehaus.groovy.tools.GroovyStarter.rootLoader(GroovyStarter.java:106)
at org.codehaus.groovy.tools.GroovyStarter.main(GroovyStarter.java:124)
Caused by: java.lang.UnsatisfiedLinkError: Could not load library. Reasons: [no jansi in java.library.path, /tmp/libjansi-64-3695606470401720252.so: /tmp/libjansi-64-3695606470401720252.so: failed to map segment from shared object: Operation not permitted]
at org.fusesource.hawtjni.runtime.Library.doLoad(Library.java:182)
at org.fusesource.hawtjni.runtime.Library.load(Library.java:140)
at org.fusesource.jansi.internal.CLibrary.<clinit>(CLibrary.java:42)
at org.fusesource.jansi.AnsiConsole.wrapOutputStream(AnsiConsole.java:48)
at org.fusesource.jansi.AnsiConsole.<clinit>(AnsiConsole.java:38)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.lambda$createCallStaticSite$2(CallSiteArray.java:65)
at java.security.AccessController.doPrivileged(Native Method)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.createCallStaticSite(CallSiteArray.java:63)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.createCallSite(CallSiteArray.java:156)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:115)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:119)
at org.apache.groovy.groovysh.Main.installAnsi(Main.groovy:249)
at org.apache.groovy.groovysh.Main.setTerminalType(Main.groovy:235)
at org.apache.groovy.groovysh.Main.main(Main.groovy:120)
... 6 more
As far as I know this kind of issue comes not from Groovy itself, but from your user not having write rights to /tmp. For example if your tmp is mounted readonly.
Background: Jansi requires native libraries, that are part of the jar. Java cannot load them form the jar and requires them to be put "somewhere", which is usually /tmp. Since it seems your tmp cannot be written you get the "Operation not permitted".
I'm using HDP2.6. where is installed oozie 4.2. and Spark2.
After I tracked Hortonworks guide on this site: https://docs.hortonworks.com/HDPDocuments/HDP2/HDP-2.6.1/bk_spark-component-guide/content/ch_oozie-spark-action.html for adding libs for Spark2 in 4.2. version of Oozie.
After I submit the job with this add-on:
oozie.action.sharelib.for.spark=spark2
The error I'm getting is this:
2017-07-19 12:36:53,271 WARN SparkActionExecutor:523 - SERVER[] USER[admin] GROUP[-] TOKEN[] APP[Workflow2] JOB[0000012-170717153234639-oozie-oozi-W] ACTION[0000012-170717153234639-oozie-oozi-W#spark_1] Launcher ERROR, reason: Main class [org.apache.oozie.action.hadoop.SparkMain], main() threw exception, Attempt to add (hdfs://:8020/user/oozie/share/lib/lib_20170613110051/oozie/aws-java-sdk-core-1.10.6.jar) multiple times to the distributed cache.
2017-07-19 12:36:53,275 WARN SparkActionExecutor:523 - SERVER[] USER[admin] GROUP[-] TOKEN[] APP[Workflow2] JOB[0000012-170717153234639-oozie-oozi-W] ACTION[0000012-170717153234639-oozie-oozi-W#spark_1] Launcher exception: Attempt to add (hdfs://:8020/user/oozie/share/lib/lib_20170613110051/oozie/aws-java-sdk-core-1.10.6.jar) multiple times to the distributed cache.
java.lang.IllegalArgumentException: Attempt to add (hdfs://:8020/user/oozie/share/lib/lib_20170613110051/oozie/aws-java-sdk-core-1.10.6.jar) multiple times to the distributed cache.
at org.apache.spark.deploy.yarn.Client$$anonfun$prepareLocalResources$13$$anonfun$apply$8.apply(Client.scala:629)
at org.apache.spark.deploy.yarn.Client$$anonfun$prepareLocalResources$13$$anonfun$apply$8.apply(Client.scala:620)
at scala.collection.mutable.ArraySeq.foreach(ArraySeq.scala:74)
at org.apache.spark.deploy.yarn.Client$$anonfun$prepareLocalResources$13.apply(Client.scala:620)
at org.apache.spark.deploy.yarn.Client$$anonfun$prepareLocalResources$13.apply(Client.scala:619)
at scala.collection.immutable.List.foreach(List.scala:381)
at org.apache.spark.deploy.yarn.Client.prepareLocalResources(Client.scala:619)
at org.apache.spark.deploy.yarn.Client.createContainerLaunchContext(Client.scala:892)
at org.apache.spark.deploy.yarn.Client.submitApplication(Client.scala:171)
at org.apache.spark.deploy.yarn.Client.run(Client.scala:1228)
at org.apache.spark.deploy.yarn.Client$.main(Client.scala:1287)
at org.apache.spark.deploy.yarn.Client.main(Client.scala)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:745)
at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:187)
at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:212)
at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:126)
at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
at org.apache.oozie.action.hadoop.SparkMain.runSpark(SparkMain.java:311)
at org.apache.oozie.action.hadoop.SparkMain.run(SparkMain.java:232)
at org.apache.oozie.action.hadoop.LauncherMain.run(LauncherMain.java:58)
at org.apache.oozie.action.hadoop.SparkMain.main(SparkMain.java:62)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.apache.oozie.action.hadoop.LauncherMapper.map(LauncherMapper.java:239)
at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:54)
at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:453)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:343)
at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:170)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:422)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1866)
at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:164)
I have read that new Spark2 will not work with Spark 2.1 (via oozie anyway) due to a change in how Spark handles multiple files found in distributed cache, as mentioned here: see here
Keep in mind that I'm using Ambari and HDP2.6. How can I deal with this?
You need to check the content of the oozie directory and spark2 directory into the Oozie sharelib. If there are any jars present into both, just remove them from one place and try again. Also, do execute the oozie admin sharelub update command to update it.
Hope this will help you.
I have already followed similar questions and answers but none of them helped me.
I have setup code on bit bucket, Integrated everything in jenkins. Added Chromedriver and Phantom JS pakage to folder /opt/
Added /opt/ permission to 777.
I tried to execute build with both [Chromedriver and Phantomjs] one by one but having same error.
Stack Trace :
java.lang.IllegalStateException: The driver is not executable: /opt/chromedriver
at com.google.common.base.Preconditions.checkState(Preconditions.java:197)
at org.openqa.selenium.remote.service.DriverService.checkExecutable(DriverService.java:126)
at org.openqa.selenium.remote.service.DriverService.findExecutable(DriverService.java:117)
at org.openqa.selenium.chrome.ChromeDriverService.access$000(ChromeDriverService.java:32)
at org.openqa.selenium.chrome.ChromeDriverService$Builder.findDefaultExecutable(ChromeDriverService.java:118)
at org.openqa.selenium.remote.service.DriverService$Builder.build(DriverService.java:291)
at org.openqa.selenium.chrome.ChromeDriverService.createDefaultService(ChromeDriverService.java:82)
at org.openqa.selenium.chrome.ChromeDriver.<init>(ChromeDriver.java:117)
at Testcases.BaseTest.Setup(BaseTest.java:55)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:80)
at org.testng.internal.Invoker.invokeConfigurationMethod(Invoker.java:564)
at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:213)
at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:138)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:277)
at org.testng.SuiteRunner.run(SuiteRunner.java:240)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1198)
at org.testng.TestNG.runSuitesLocally(TestNG.java:1123)
at org.testng.TestNG.run(TestNG.java:1031)
at org.apache.maven.surefire.testng.TestNGExecutor.run(TestNGExecutor.java:77)
at org.apache.maven.surefire.testng.TestNGDirectoryTestSuite.execute(TestNGDirectoryTestSuite.java:110)
at org.apache.maven.surefire.testng.TestNGProvider.invoke(TestNGProvider.java:106)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:189)
at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:165)
at org.apache.maven.surefire.booter.ProviderFactory.invokeProvider(ProviderFactory.java:85)
at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:115)
at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:75)
I'm trying to run Spark on Windows 10 with hadoop on the official Microsoft terminal cmd.exe.
I don't have problem with Hadoop. The installation and stating is OK.
I'm using Java 8 x64 (jdk1.8.0_92)
When I start Spark with the command spark-shell, I got the Java error bellow :
[ERROR] Terminal initialization failed; falling back to unsupported
java.lang.NoClassDefFoundError: Could not initialize class scala.tools.fusesource_embedded.jansi.internal.Kernel32
at scala.tools.fusesource_embedded.jansi.internal.WindowsSupport.getConsoleMode(WindowsSupport.java:50)
at scala.tools.jline_embedded.WindowsTerminal.getConsoleMode(WindowsTerminal.java:204)
at scala.tools.jline_embedded.WindowsTerminal.init(WindowsTerminal.java:82)
at scala.tools.jline_embedded.TerminalFactory.create(TerminalFactory.java:101)
at scala.tools.jline_embedded.TerminalFactory.get(TerminalFactory.java:158)
at scala.tools.jline_embedded.console.ConsoleReader.(ConsoleReader.java:229)
at scala.tools.jline_embedded.console.ConsoleReader.(ConsoleReader.java:221)
at scala.tools.jline_embedded.console.ConsoleReader.(ConsoleReader.java:209)
at scala.tools.nsc.interpreter.jline_embedded.JLineConsoleReader.(JLineReader.scala:61)
at scala.tools.nsc.interpreter.jline_embedded.InteractiveReader.(JLineReader.scala:33)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at scala.tools.nsc.interpreter.ILoop$$anonfun$scala$tools$nsc$interpreter$ILoop$$instantiate$1$1.apply(ILoop.scala:865)
at scala.tools.nsc.interpreter.ILoop$$anonfun$scala$tools$nsc$interpreter$ILoop$$instantiate$1$1.apply(ILoop.scala:862)
at scala.tools.nsc.interpreter.ILoop.scala$tools$nsc$interpreter$ILoop$$mkReader$1(ILoop.scala:871)
at scala.tools.nsc.interpreter.ILoop$$anonfun$15$$anonfun$apply$8.apply(ILoop.scala:875)
at scala.tools.nsc.interpreter.ILoop$$anonfun$15$$anonfun$apply$8.apply(ILoop.scala:875)
at scala.util.Try$.apply(Try.scala:192)
at scala.tools.nsc.interpreter.ILoop$$anonfun$15.apply(ILoop.scala:875)
at scala.tools.nsc.interpreter.ILoop$$anonfun$15.apply(ILoop.scala:875)
at scala.collection.immutable.Stream$$anonfun$map$1.apply(Stream.scala:418)
at scala.collection.immutable.Stream$$anonfun$map$1.apply(Stream.scala:418)
at scala.collection.immutable.Stream$Cons.tail(Stream.scala:1233)
at scala.collection.immutable.Stream$Cons.tail(Stream.scala:1223)
at scala.collection.immutable.Stream.collect(Stream.scala:435)
at scala.tools.nsc.interpreter.ILoop.chooseReader(ILoop.scala:877)
at scala.tools.nsc.interpreter.ILoop$$anonfun$process$1$$anonfun$apply$mcZ$sp$2.apply(ILoop.scala:916)
at scala.tools.nsc.interpreter.ILoop$$anonfun$process$1.apply$mcZ$sp(ILoop.scala:916)
at scala.tools.nsc.interpreter.ILoop$$anonfun$process$1.apply(ILoop.scala:911)
at scala.tools.nsc.interpreter.ILoop$$anonfun$process$1.apply(ILoop.scala:911)
at scala.reflect.internal.util.ScalaClassLoader$.savingContextLoader(ScalaClassLoader.scala:97)
at scala.tools.nsc.interpreter.ILoop.process(ILoop.scala:911)
at org.apache.spark.repl.Main$.main(Main.scala:49)
at org.apache.spark.repl.Main.main(Main.scala)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:731)
at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:181)
at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:206)
at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:121)
at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
I get exactly the same stack trace when opening the scala console in Netbeans. If I type any scala expression below the stack trace, it works fine though.
There is a coredump file created in one machine, But when i move it to other machine (which have the same java version), use the same command to analyze, it faild.
the command is like that below,
db -connect sun.jvm.hotspot.jdi.SACoreAttachingConnector:javaExecutable=/home/xxxx/app/jdk1.6.0_31/bin/java,core=core.java.1409350847.30890
and the error message is:
java.io.IOException at
sun.jvm.hotspot.jdi.SACoreAttachingConnector.attach(SACoreAttachingConnector.java:139)
at
com.sun.tools.example.debug.tty.VMConnection.attachTarget(VMConnection.java:358)
at
com.sun.tools.example.debug.tty.VMConnection.open(VMConnection.java:168)
at com.sun.tools.example.debug.tty.Env.init(Env.java:64) at
com.sun.tools.example.debug.tty.TTY.main(TTY.java:1010)
Caused by:
java.lang.reflect.InvocationTargetException 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
sun.jvm.hotspot.jdi.SACoreAttachingConnector.createVirtualMachine(SACoreAttachingConnector.java:96)
at
sun.jvm.hotspot.jdi.SACoreAttachingConnector.attach(SACoreAttachingConnector.java:124)
... 4 more
Caused by: sun.jvm.hotspot.debugger.DebuggerException:
Doesn't appear to be a HotSpot VM (could not find symbol
"gHotSpotVMTypes" in remote process) at
sun.jvm.hotspot.HotSpotAgent.setupVM(HotSpotAgent.java:400) at
sun.jvm.hotspot.HotSpotAgent.go(HotSpotAgent.java:315) at
sun.jvm.hotspot.HotSpotAgent.attach(HotSpotAgent.java:174) at
sun.jvm.hotspot.jdi.VirtualMachineImpl.createVirtualMachineForCorefile(VirtualMachineImpl.java:206)
... 10 more
who can tell me why? Thanks very much.