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32 bit class file on 64 bit runtime

 
Jyotika Kapoor
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Hi All,

I have a small doubt , how good is it a practice to run a java class file compiled on 32 bit OS on a OS which has jvm for 64 bit OS. I tried googling but could not find anything really worth while , rather what ever i found has confused me more , would be really thankful if you people can help.


Thanks,
Jyotika
 
Campbell Ritchie
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Welcome to JavaRanch

Never tried it, but the .class files are in bytecode which is independent of the bits used by the processor, so I would think it will run happily without modification.
 
Jyotika Kapoor
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Thanks Campbell,

I sort of agree , but then . I am trying to deploy a webservice using Axis 1.4 and Sun jdk 5 , when i trying deploying it on 64 bit jvm i get the following error stack trace


20:54:53,210 ERROR [[AxisServlet]] Servlet.service() for servlet AxisServlet threw exception
java.lang.NoClassDefFoundError
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:242)
at org.apache.axis.utils.ClassUtils$2.run(ClassUtils.java:177)
at java.security.AccessController.doPrivileged(Native Method)
at org.apache.axis.utils.ClassUtils.loadClass(ClassUtils.java:160)
at org.apache.axis.utils.ClassUtils.forName(ClassUtils.java:142)
at org.apache.axis.utils.cache.ClassCache.lookup(ClassCache.java:85)
at org.apache.axis.providers.java.JavaProvider.getServiceClass(JavaProvider.java:428)
at org.apache.axis.providers.java.JavaProvider.initServiceDesc(JavaProvider.java:461)
at org.apache.axis.handlers.soap.SOAPService.getInitializedServiceDesc(SOAPService.java:286)
at org.apache.axis.deployment.wsdd.WSDDService.makeNewInstance(WSDDService.java:500)
at org.apache.axis.deployment.wsdd.WSDDDeployment.getDeployedServices(WSDDDeployment.java:503)
at org.apache.axis.configuration.FileProvider.getDeployedServices(FileProvider.java:296)
at org.apache.axis.transport.http.AxisServlet.reportAvailableServices(AxisServlet.java:482)
at org.apache.axis.transport.http.AxisServlet.doGet(AxisServlet.java:260)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
at org.apache.axis.transport.http.AxisServletBase.service(AxisServletBase.java:327)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)
at java.lang.Thread.run(Thread.java:595)

but if i change the java home to point to jdk 1.5 for 32 bit it goes fine . I really dont understand why



Thanks

 
Campbell Ritchie
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You're welcome

It is worthwhile checking the class which couldn't be found: see whether it was introduced in Java 5.
 
Henry Wong
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To answer the original question, when Java bytecodes are loaded into the JVM, they are either interpreted (initially in server mode) and/or just-in-time compiled (JIT). It is this JIT that creates either 32 bit codes or 64 bits codes depending on the type of machine.

Basically, Java runs "natively" regardless of the processor, or the number of bits.

Henry
 
Jyotika Kapoor
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Hello Campbell,

I might sound stupid but i really dont understand what is that class it is trying to instantiate and is not finding it ,
in the above logs.


Thanks,
Jyotika
 
Moojid Hamid
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Is the 64 bit version a JRE or a JDK? if it is a JRE try using a JDK.
 
Jyotika Kapoor
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Hello Hamid,

The code was compiled on 32 bit jdk1.5 (as always windows machine) , i am deploying it on a Linux box which has 64 bit jdk and the
jre.

Thanks,
Jyotika
 
Moojid Hamid
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Which one is your CLASS_PATH point to, JDK or JRE?
 
Jyotika Kapoor
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Hi ,

Its the jdk it is pointing to ...

Jyotika
 
Moojid Hamid
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how about JAVA_HOME?
 
Jesper de Jong
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The problem looks like a classpath error, the program is trying to load a class that's not in the classpath. Check if all the required JAR files and class directories are in the classpath and if your software is configured correctly.

It does not have anything to do with 32-bit or 64-bit.
 
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