jre compiling error

I got an error when I tried to compile the project(jsp,java) in Eclipse.

can anyone shed any light on this? thanks.

This is the error message:

Aug 22, 2006 4:00:38 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet jsp threw exception
org.apache.jasper.JasperException: Unable to compile class for JSP

An error occurred at line: -1 in the jsp file: null

Generated servlet error:
[javac] Compiling 1 source file

C:\Documents and Settings\jbrad\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\work\Catalina\localhost\PTest\jvindex_jsp.java:8: cannot access java.lang.Object
bad class file: C:\Program Files\Java\jre1.5.0_08\lib\rt.jar(java/lang/Object.class)
class file has wrong version 49.0, should be 48.0
Please remove or make sure it appears in the correct subdirectory of the classpath.
public class jvindex_jsp extends HttpJspBase {
^
1 error

at org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:120)
at org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:293)
at org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:313)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:324)
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:474)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:184)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:289)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:240)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Unknown Source)

you got your compiler and runtime versions mixed up.
This question has been asked on every Java forum I know of at least once a week for the last 2 years or so.

Trying to load a 1.5 classfile (in this case the JRE itself) with a 1.4 runtime isn't going to work.

This line:

class file has wrong version 49.0, should be 48.0

suggests that you are mixing different versions of Java - versions 1.4 and 1.5. Make sure that you are running Tomcat on Java 1.5 and that it uses JDK 1.5 to compile the JSP's. Right now, it looks like Tomcat is using JDK 1.4 to compile the JSP's.

Which version of Tomcat are you using? I think the newest versions of Tomcat require Java 1.5 (check the Tomcat documentation), are you trying to run it on Java 1.4?

thanks for the reply.

I did run on Tomcat 5.5 and jre 1.5.

I can't see what the issue is.

Originally posted by jenny brad:
I can't see what the issue is.

You have JDK 1.4 on your system somewhere and for some reason Tomcat is picking that version up to compile your JSP's.

- Uninstall any version 1.4 JDK and JRE from your system.
- Check that JDK 1.4 is not referenced in the PATH environment variable.

I removed the jre 1.4 and jdk 1.4 on my PC. still having the same error.

what else can it be?

Thanks.

in that case you didn't remove them completely.

Most likely you still have java.exe, javaw.exe, and javaws.exe from the 1.4 in your windows/system32 directory. Remove those.

Open a command prompt window. Type in the following commands - what is the output? Copy & paste the output here and we can help you further.

java -version

echo %PATH%

echo %JAVA_HOME%

This is the output in cmd. Thank you for further help.

C:\Documents and Settings\jj>java -version
java version "1.5.0_08"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_08-b03)
Java HotSpot(TM) Client VM (build 1.5.0_08-b03, mixed mode, sharing)

C:\Documents and Settings\jj>echo %PATH%
C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\Program Files\Symante
c\pcAnywhere\;C:\Sun\AppServer\bin

C:\Documents and Settings\jj>echo %JAVA_HOME%
%JAVA_HOME%

Hmmm, there's nothing that looks odd there.

Have a look at the Tomcat logfiles. Maybe it's telling you more about what JDK Tomcat is picking up. And carefully examine your system again, because you do have another JDK than Sun JDK 1.5 installed somewhere. Do you have an IBM JDK or Oracle software, or BEA WebLogic or some other piece of software installed that has its own JDK somewhere? Does the Sun appserver stuff have its own JDK?

It's really impossible that you get the class version error if JDK 1.5 is the only JDK that's on your system.

As a last resort, try removing and re-installing JDK 1.5. Although unlikely, maybe something has gotten corrupt in your JDK.
[ August 24, 2006: Message edited by: Jesper Young ]