Error using .jar file

Hi,
following error on a system at V5R1M0, JDK 1.3.1, same error by starting a 
normal application packed in jars.
PTF's are loaded.
Never see on other systems at same level.

Somebody already see this error ?
Thanks for help.
Franco.

jar -x IniFile.jar                                                              
                                    
java.lang.UnsatisfiedLinkError                                                  
                                    
      java/lang/Error.<init>()V+1 (Error.java:37)                               
                                    
      java/lang/LinkageError.<init>()V+1 (LinkageError.java:29)                 
                                    
      java/lang/UnsatisfiedLinkError.<init>()V+1 (UnsatisfiedLinkError.java:28) 
                                    
      java/util/zip/ZipFile.<init>(Ljava/io/File;I)V+79 (ZipFile.java:110)      
                                    
      java/util/jar/JarFile.<init>(Ljava/lang/String;)V+9 (JarFile.java:57)     
                                    
      
sun/misc/URLClassPath$JarLoader.getJarFile(Ljava/net/URL;)Ljava/util/jar/JarFile;+50
 (URLClassPath.java:496)  

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Franco Biaggi
CH-6807 Taverne