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ajermakovics / jvm-mon

Console-based JVM monitoring tool
https://ajermakovics.github.io/jvm-mon/
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UnsatisfiedLinkError: Could not load J2V8 library. Reasons: no j2v8_linux_x86_64 in java.library.path #10

Closed trumpetx closed 7 years ago

trumpetx commented 7 years ago

Executing from a VM, unzipped package, CentOS 6

Java HotSpot(TM) 64-Bit Server VM warning: You have loaded library /home/rss/libj2v8_linux_x86_64.so which might have disabled stack guard. The VM will try to fix the stack guard now.
It's highly recommended that you fix the library with 'execstack -c <libfile>', or link it with '-z noexecstack'.
Exception in thread "main" java.lang.ExceptionInInitializerError
Caused by: java.lang.IllegalStateException: J2V8 native library not loaded
    at com.eclipsesource.v8.V8.checkNativeLibraryLoaded(V8.java:195)
    at com.eclipsesource.v8.V8.createV8Runtime(V8.java:149)
    at com.eclipsesource.v8.V8.createV8Runtime(V8.java:125)
    at com.eclipsesource.v8.NodeJS.createNodeJS(NodeJS.java:58)
    at com.eclipsesource.v8.NodeJS.createNodeJS(NodeJS.java:45)
    at JvmMon.<clinit>(JvmMon.java:12)
Caused by: java.lang.UnsatisfiedLinkError: Could not load J2V8 library. Reasons:
    no j2v8_linux_x86_64 in java.library.path
    /home/rss/libj2v8_linux_x86_64.so: /usr/lib64/libstdc++.so.6: version `GLIBCXX_3.4.15' not found (required by /home/rss/libj2v8_linux_x86_64.so)

    at com.eclipsesource.v8.LibraryLoader.loadLibrary(LibraryLoader.java:75)
    at com.eclipsesource.v8.V8.load(V8.java:71)
    at com.eclipsesource.v8.V8.createV8Runtime(V8.java:145)
    ... 4 more
ajermakovics commented 7 years ago

Looks like this might be an open issue https://github.com/eclipsesource/J2V8/issues/188

jncharon commented 7 years ago

Hi,

I have the same error here on windows 10 64 : UnsatisfiedLinkError: Could not load J2V8 library. Reasons: no j2v8_win32_x86_64 in java.library.path

It's weird as the lib in in my build.gradle

CorrectHorseBatteryStapple commented 7 years ago

same on jvm-mon-0.2, windows 7, java 1.8.0_111. Really looking forward to use this interesting tool from command line

jvm-mon.bat

Exception in thread "main" java.lang.ExceptionInInitializerError
Caused by: java.lang.IllegalStateException: J2V8 native library not loaded
        at com.eclipsesource.v8.V8.checkNativeLibraryLoaded(V8.java:195)
        at com.eclipsesource.v8.V8.createV8Runtime(V8.java:149)
        at com.eclipsesource.v8.V8.createV8Runtime(V8.java:125)
        at com.eclipsesource.v8.NodeJS.createNodeJS(NodeJS.java:58)
        at com.eclipsesource.v8.NodeJS.createNodeJS(NodeJS.java:45)
        at JvmMon.<clinit>(JvmMon.java:18)
Caused by: java.lang.UnsatisfiedLinkError: Could not load J2V8 library. Reasons:
        no j2v8_win32_x86_64 in java.library.path

        at com.eclipsesource.v8.LibraryLoader.loadLibrary(LibraryLoader.java:75)
        at com.eclipsesource.v8.V8.load(V8.java:71)
        at com.eclipsesource.v8.V8.createV8Runtime(V8.java:145)
        ... 4 more
ajermakovics commented 7 years ago

At the moment in only runs on Linux an MacOS, #1 There is a windows version of J2v8 library so it should work but haven't tried it yet

sanbor commented 7 years ago

On Ubuntu 16.04 I was getting this warning, but the issue was that I didn't have set JAVA_HOME.

user@ubuntuuser ~/Downloads/jvm-mon-0.2
 % ./bin/jvm-mon        
$JAVA_HOME/lib/tools.jar not found
OpenJDK 64-Bit Server VM warning: You have loaded library /home/user/libj2v8_linux_x86_64.so which might have disabled stack guard. The VM will try to fix the stack guard now.
It's highly recommended that you fix the library with 'execstack -c <libfile>', or link it with '-z noexecstack'.
Exception in thread "main" java.lang.NoClassDefFoundError: sun/jvmstat/monitor/MonitorException
    at com.jvmtop.view.VMOverviewView.scanForNewVMs(VMOverviewView.java:165)
    at JvmMon.update(JvmMon.java:50)
    at JvmMon.<init>(JvmMon.java:45)
    at JvmMon.main(JvmMon.java:27)
Caused by: java.lang.ClassNotFoundException: sun.jvmstat.monitor.MonitorException
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 4 more
user@ubuntuuser ~/Downloads/jvm-mon-0.2
 % export JAVA_HOME="/usr/lib/jvm/java-8-openjdk-amd64"
user@ubuntuuser ~/Downloads/jvm-mon-0.2
 % ./bin/jvm-mon                               
OpenJDK 64-Bit Server VM warning: You have loaded library /home/user/libj2v8_linux_x86_64.so which might have disabled stack guard. The VM will try to fix the stack guard now.
It's highly recommended that you fix the library with 'execstack -c <libfile>', or link it with '-z noexecstack'.

... jvm-mon opens ...

Maybe the script should check if $JAVA_HOME is set and exit if not.

ajermakovics commented 7 years ago

Maybe the script should check if $JAVA_HOME is set and exit if not.

Probably a good idea

winston01 commented 7 years ago

Definitely.

ajermakovics commented 7 years ago

The new script in version 0.3 does the check and automatically sets JAVA_HOME on Mac (if not set already).

cupdike commented 7 years ago

I also got this error trying to run as another user. The app seems to need write permissions on the install directories/files. If that's correct, would suggest adding a test for this in the startup script.

ramprasathdgl commented 6 years ago

I too got this error running as a different user.