Develop Reference

My application can not be launched on java 8u231

I am trying to launch my application on java 8u231, but it failed with error "A JNI error has occurred, please check your installation and try again". However, the same application can be launched on java 8u102.
java -version
java version "1.8.0_231"
Java(TM) SE Runtime Environment (build 1.8.0_231-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.231-b11, mixed mode)
PATH=%PATH%;.\lib
java -D... -Xmx512m MyFullApplication
11/18-16:23:49.00356 [main#1] jdk.internal.event.EventHelper.logX509CertificateEvent
FINE: X509Certificate: Alg:{0}, Serial:{1}, Subject:{2}, Issuer:{3}, Key type:{4}, Length:{5}, Cert Id:{6}, Valid from:{7}, Valid until:{8}
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.NullPointerException
at java.util.jar.JarVerifier.processEntry(Unknown Source)
at java.util.jar.JarVerifier.update(Unknown Source)
at java.util.jar.JarFile.initializeVerifier(Unknown Source)
at java.util.jar.JarFile.ensureInitialization(Unknown Source)
at java.util.jar.JavaUtilJarAccessImpl.ensureInitialization(Unknown Source)
at sun.misc.URLClassPath$JarLoader$2.getManifest(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)
I am launching my application from command line but not from the Eclipse. The jar file is pre-built and I can launch the jar with java 8u102 and java 8u221, but it can not be launched by java 8u231, so I guess is there bug of JRE itself which introduced this issue?

How to resolve dll UnsatisfiedLinkError when using JNA 4.2.0 with Java 6 on Windows 7.1?

I'm using version 4.2.0 of the JNA libraries from here: https://github.com/java-native-access/jna.
My application works absolutely fine on Java 7 & 8 32-bit on a 64-bit Windows 7.1 machine.
When I try to load it using Java 6 32-bit, I get this error:
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.sun.javaws.Launcher.executeApplication(Unknown Source)
at com.sun.javaws.Launcher.executeMainClass(Unknown Source)
at com.sun.javaws.Launcher.doLaunchApp(Unknown Source)
at com.sun.javaws.Launcher.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.UnsatisfiedLinkError: C:\Users\user\AppData\Local\Temp\jna-205523658\jna1343790277438028829.dll: Can't find dependent libraries
at java.lang.ClassLoader$NativeLibrary.load(Native Method)
at java.lang.ClassLoader.loadLibrary0(Unknown Source)
at java.lang.ClassLoader.loadLibrary(Unknown Source)
at java.lang.Runtime.load0(Unknown Source)
at java.lang.System.load(Unknown Source)
at com.sun.jna.Native.loadNativeDispatchLibraryFromClasspath(Native.java:851)
at com.sun.jna.Native.loadNativeDispatchLibrary(Native.java:826)
at com.sun.jna.Native.<clinit>(Native.java:140)
at com.sun.jna.Pointer.<clinit>(Pointer.java:41)
at com.sun.jna.platform.win32.WinReg$HKEY.<init>(WinReg.java:32)
at com.sun.jna.platform.win32.WinReg.<clinit>(WinReg.java:61)
Is this an incompatibility issue between 32-bit Java 6 on a 64-bit OS? Is there anything I can do about it?
My problem is that I need to deploy my app to a wide user base all with different permutations of Java 32-bit on different Windows operating systems.

Including Jar while executing Java from Bat file

I want to execute a Java class from a bat file and it include usage of opencsv.jar.
Below is the code:
#echo off
set path=%PATH%;C:\Program Files (x86)\Java\jdk1.6.0\bin
javac -cp opencsv.jar ArbitrageUsingThread.java
java ArbitrageUsingThread
I am getting the following error when running it. I think there is some problem with including opencsv.jar Can anyone help me with this?
Error
Exception in thread "main" java.lang.NoClassDefFoundError: au/com/bytecode/openc
sv/CSVWriter
at ArbitrageUsingThread.main(ArbitrageUsingThread.java:67)
Caused by: java.lang.ClassNotFoundException: au.com.bytecode.opencsv.CSVWriter
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 1 more

java is similar to javac for classpath.
Under linux:
java -cp opencsv.jar:. ArbitrageUsingThread
Under windows:
java -cp opencsv.jar;. ArbitrageUsingThread

error could not find the main class program will exit after netbeans

When i compile and run my program in eclipse, it works.
When i run my .jar program on my personal computer (Windows 8 with java JDK 7), it works.
But when i'm trying to run .jar in others computers, it doesn't work.
So i tried to run with command line java -jar myjar
and i got this message which i can't understand
java -jar "Bureau\Application SNCF\SNCF.jar"
Exception in thread "main" java.lang.UnsupportedClassVersionError: Bad version number in .class file
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
Does anyone understand this message error?
Thanks for your help

This is always caused by the conflict of different Java JDK at compile time and runtime, make sure you are using same JDK version to compile and run it.

Running Windows XP batch on Windows 7

I have a batch file which runs on XP:
#echo off
#setlocal
set CWD=%~dp0
set JYTHON_HOME=%CWD%
set LIB_DIR=%JYTHON_HOME%/lib
java -cp %LIB_DIR% -jar %LIB_DIR%/jython.jar -Djython.home=%CWD%
-Dpython.path=%LIB_DIR%;%CWD%/ext %LIB_DIR%clenotes/clenotes.py %*
#endlocal
I want to run this file on Windows 7.
EDIT:
When I run it this error occurs:
Exception in thread "main" java.lang.NoClassDefFoundError:
folder\CLENotes\lib Caused by: java.lang.ClassNotFoundException:
folder\CLENotes\lib
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)

Actually it is very simple, I needed to change the fowardslashes (/) to backslashes.