Web Resource for Java Programmers: Tomcat Jsp Run Error:Unable to find a javac compiler

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Tomcat : Tomcat Jsp Run Error:Unable To Find A Javac Compiler

Question : I always get this error when I run simple jsp files in my Tomcat 5.0.19/win2000.
These jsp files run on other versions of Tomcat on the same PC.
Any ideas?

Complete console messages. You can see tools.jar IS in the classpath.

========================================================================
Apr 15, 2004 9:26:06 AM org.apache.jasper.compiler.Compiler generateClass
SEVERE: Javac exception
Unable to find a javac compiler;
com.sun.tools.javac.Main is not on the classpath.
Perhaps JAVA_HOME does not point to the JDK
at org.apache.tools.ant.taskdefs.compilers.CompilerAdapterFactory.getCom
piler(CompilerAdapterFactory.java:139)
at org.apache.tools.ant.taskdefs.Javac.compile(Javac.java:835)
at org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:682)
at org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:390)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:458)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:439)
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext
.java:553)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper
.java:291)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:3
01)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:284)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:204)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:257)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
eContext.java:151)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:567)
at org.apache.catalina.core.StandardContextValve.invokeInternal(Standard
ContextValve.java:245)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:199)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
eContext.java:151)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(Authentica
torBase.java:509)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
eContext.java:149)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:567)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:184)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
eContext.java:151)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:164)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
eContext.java:149)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:567)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:156)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
eContext.java:151)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:567)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:972)

at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:20
6)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:833)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.proce
ssConnection(Http11Protocol.java:732)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java
:619)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadP
ool.java:688)
at java.lang.Thread.run(Thread.java:534)
Apr 15, 2004 9:26:06 AM org.apache.jasper.compiler.Compiler generateClass
SEVERE: Env: Compile: javaFileName=/C:/tomcat5019/work/Catalina/localhost/jsp-ex
amples//org/apache/jsp/dates\date1_jsp.java
classpath=/C:/tomcat5019/webapps/jsp-examples/WEB-INF/classes/;/C:/tomcat501
9/webapps/jsp-examples/WEB-INF/lib/jstl.jar;/C:/tomcat5019/webapps/jsp-examples/
WEB-INF/lib/standard.jar;C:\tomcat5019\work\Catalina\localhost\jsp-examples;/C:/
tomcat5019/webapps/jsp-examples/WEB-INF/classes/;/C:/tomcat5019/webapps/jsp-exam
ples/WEB-INF/lib/jstl.jar;/C:/tomcat5019/webapps/jsp-examples/WEB-INF/lib/standa
rd.jar;C:/tomcat5019/shared/classes/;C:/tomcat5019/common/classes/;C:/tomcat5019
/common/endorsed/xercesImpl.jar;C:/tomcat5019/common/endorsed/xmlParserAPIs.jar;
C:/tomcat5019/common/lib/ant.jar;C:/tomcat5019/common/lib/commons-collections.ja
r;C:/tomcat5019/common/lib/commons-dbcp-1.1.jar;C:/tomcat5019/common/lib/commons
-el.jar;C:/tomcat5019/common/lib/commons-pool-1.1.jar;C:/tomcat5019/common/lib/j
asper-compiler.jar;C:/tomcat5019/common/lib/jasper-runtime.jar;C:/tomcat5019/com
mon/lib/jmx.jar;C:/tomcat5019/common/lib/jsp-api.jar;C:/tomcat5019/common/lib/na
ming-common.jar;C:/tomcat5019/common/lib/naming-factory.jar;C:/tomcat5019/common
/lib/naming-java.jar;C:/tomcat5019/common/lib/naming-resources.jar;C:/tomcat5019
/common/lib/servlet-api.jar;/C:/j2sdk1.4.2/lib/tools.jar;/C:/tomcat5019/bin/boot
strap.jar;/C:/j2sdk1.4.2/jre/lib/ext/mrcjs11.jar;/C:/j2sdk1.4.2/jre/lib/ext/ant.
jar;/C:/j2sdk1.4.2/jre/lib/ext/jt400.jar;/C:/j2sdk1.4.2/jre/lib/ext/mrcextobj.ja
r;/C:/j2sdk1.4.2/jre/lib/ext/dnsns.jar;/C:/j2sdk1.4.2/jre/lib/ext/ldapsec.jar;/C
:/j2sdk1.4.2/jre/lib/ext/sunjce_provider.jar;/C:/j2sdk1.4.2/jre/lib/ext/localeda
ta.jar
cp=C:\j2sdk1.4.2\lib\tools.jar;..\bin\bootstrap.jar
cp=C:\tomcat5019\webapps\jsp-examples\WEB-INF\classes
cp=C:\tomcat5019\webapps\jsp-examples\WEB-INF\lib\jstl.jar
cp=C:\tomcat5019\webapps\jsp-examples\WEB-INF\lib\standard.jar
cp=C:\tomcat5019\work\Catalina\localhost\jsp-examples
cp=C:\tomcat5019\webapps\jsp-examples\WEB-INF\classes
cp=C:\tomcat5019\webapps\jsp-examples\WEB-INF\lib\jstl.jar
cp=C:\tomcat5019\webapps\jsp-examples\WEB-INF\lib\standard.jar
cp=C:\tomcat5019\shared\classes
cp=C:\tomcat5019\common\classes
cp=C:\tomcat5019\common\endorsed\xercesImpl.jar
cp=C:\tomcat5019\common\endorsed\xmlParserAPIs.jar
cp=C:\tomcat5019\common\lib\ant.jar
cp=C:\tomcat5019\common\lib\commons-collections.jar
cp=C:\tomcat5019\common\lib\commons-dbcp-1.1.jar
cp=C:\tomcat5019\common\lib\commons-el.jar
cp=C:\tomcat5019\common\lib\commons-pool-1.1.jar
cp=C:\tomcat5019\common\lib\jasper-compiler.jar
cp=C:\tomcat5019\common\lib\jasper-runtime.jar
cp=C:\tomcat5019\common\lib\jmx.jar
cp=C:\tomcat5019\common\lib\jsp-api.jar
cp=C:\tomcat5019\common\lib\naming-common.jar
cp=C:\tomcat5019\common\lib\naming-factory.jar
cp=C:\tomcat5019\common\lib\naming-java.jar
cp=C:\tomcat5019\common\lib\naming-resources.jar
cp=C:\tomcat5019\common\lib\servlet-api.jar
cp=C:\j2sdk1.4.2\lib\tools.jar
cp=C:\tomcat5019\bin\bootstrap.jar
cp=C:\j2sdk1.4.2\jre\lib\ext\mrcjs11.jar
cp=C:\j2sdk1.4.2\jre\lib\ext\ant.jar
cp=C:\j2sdk1.4.2\jre\lib\ext\jt400.jar
cp=C:\j2sdk1.4.2\jre\lib\ext\mrcextobj.jar
cp=C:\j2sdk1.4.2\jre\lib\ext\dnsns.jar
cp=C:\j2sdk1.4.2\jre\lib\ext\ldapsec.jar
cp=C:\j2sdk1.4.2\jre\lib\ext\sunjce_provider.jar
cp=C:\j2sdk1.4.2\jre\lib\ext\localedata.jar
work dir=C:\tomcat5019\work\Catalina\localhost\jsp-examples
extension dir=C:\j2sdk1.4.2\jre\lib\ext
srcDir=C:\tomcat5019\work\Catalina\localhost\jsp-examples
include=org/apache/jsp/dates/date1_jsp.java

Apr 15, 2004 9:26:06 AM org.apache.jasper.compiler.Compiler generateClass
SEVERE: Error compiling file: /C:/tomcat5019/work/Catalina/localhost/jsp-example
s//org/apache/jsp/dates\date1_jsp.java [javac] Compiling 1 source file

Answer: Simply open you Java installation folder and browse the lib folder (in my case it is C:\j2sdk1.4.2_03\lib) and copy the tools.jar file and paste it in your \common\lib folder. Now restart the Tomcat and njoy programming..