would like some guidance decrypting tomcat errors

1
votes

I have these errors for tomcat 7. I am uploading to a server with JDK 1.6 and running Tomcat 7.02X I keep getting these errors whatever i Do. what does this mean?

error1

INFO: Deploying web application archive user2.war Jun 8, 2012 2:51:30 AM org.apache.catalina.core.ContainerBase addChildInternal SEVERE: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[yuppie.com].StandardContext[/user2]] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:152) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:812) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:787) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:607) at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:932)

Also it goes to this error

Caused by: java.lang.UnsupportedClassVersionError: com/yuppie/Populator : Unsupported major.minor version 51.0 (unable to load class com.yuppie.Populator) at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2824) at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1150)

I apologize for listing out errors. I know its quite hated in this community, but I have no clue on these errors thats why. Thank you

One last error

SEVERE: Error deploying web application archive user2.war java.lang.IllegalStateException: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[credify.me].StandardContext[/user2]] at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:816)

2
javatomcatservlets
The second one seems to be starting Tomcat using JDK of a lower version than the version of the class file. – xiaofeng.li

2 Answers

6
votes
Caused by: java.lang.UnsupportedClassVersionError: com/yuppie/Populator : 
Unsupported  major.minor version 51.0 (unable to load class com.yuppie.Populator) at 
org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2824) 
at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1150)

Reason for this is because your java file is compiled with a later version of the JDK (eg.Java 7) while your JRE is an earlier version (eg. Java 6).

Mayb you can fix this problem first to see if you have new errors.

If you are using external libraries, then it is likely that the external library was compiled with a more recent version of the Java Compiler, as compared to the JRE you are using. I would recommend you upgrade your JRE to the latest version.

1
votes

LifecycleException indicates most probably you have a life cycle problem.

UnsupportedClassVersionError is thrown when the class file's version numbers are not supported.

IllegalStateException is as the name says, the state of the Java Application isn't legal or appropriate to handle the current request.

Porbable Fixes:

UnsupportedClassVersionError : https://stackoverflow.com/a/2467356/828625

LifecycleException : https://stackoverflow.com/a/8512930/828625

IllegalStateException : https://issues.apache.org/bugzilla/show_bug.cgi?id=50737