Tomcat: LifecycleException when deploying

Question

I just downloaded the Tomcat 7.0.23 package on my Ubuntu 11.10.

I followed the instructions on a Google API website to deploy their example webapp. It basically con

Answer 1

I am getting this error while deploying

[main] org.apache.catalina.startup.HostConfig.deployDirectory Error deploying web application directory [/opt/tomcat/apache-tomcat-9.0.30/webapps/iclock]
    java.lang.IllegalStateException: Error starting child
            at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:720)
            at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:690)
            at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:705)
            at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1133)
            at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1867)
            at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
            at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
            at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)