Exception on Tomcat server startup

[jpi...@live.com.au]

G'day guys,

I'm new to using Hotswap (configured it today). After following the steps in the Quick Setup guide I tried to start a local Tomcat server and received the following exception:

HOTSWAP AGENT: 10:56:17.448 ERROR (org.hotswap.agent.annotation.handler.OnClassLoadedHandler) - InvocationTargetException in transform method on plugin 'class org.hotswap.agent.plugin.tomcat.TomcatPlugin' class 'org/apache/catalina/loader/WebappClassLoader'.
java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:497)
        at org.hotswap.agent.annotation.handler.OnClassLoadedHandler.transform(OnClassLoadedHandler.java:157)
        at org.hotswap.agent.annotation.handler.OnClassLoadedHandler$1.transform(OnClassLoadedHandler.java:76)
        at org.hotswap.agent.util.HotswapTransformer.transform(HotswapTransformer.java:129)
        at sun.instrument.TransformerManager.transform(TransformerManager.java:188)
        at sun.instrument.InstrumentationImpl.transform(InstrumentationImpl.java:428)
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
        at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        at org.apache.catalina.loader.WebappLoader.<init>(WebappLoader.java:116)
        at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:4978)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:725)
        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:701)
        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:717)
        at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1096)
        at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1756)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
Caused by: org.hotswap.agent.javassist.NotFoundException: getResource(..) is not found in org.apache.catalina.loader.WebappClassLoader
        at org.hotswap.agent.javassist.CtClassType.getDeclaredMethod(CtClassType.java:1186)
        at org.hotswap.agent.plugin.tomcat.WebappLoaderTransformer.patchWebappClassLoader(WebappLoaderTransformer.java:188)
        ... 33 more

After splatting this in the command window, Tomcat then goes on to start up successfully. Everything in the app seems to work.

So is this exception something to worry about? Is Hotswap still operating successfully in the background?

Details:
Java 8 update 45
Tomcat 8.0.21
DCEVM Light for Java 8u45 (build 15)
HotswapAgent 0.3

[vladimir dvorak]

  Hi,

Tomcat8 is still not supported. You can disable Tomcat pugin in hotwap-agent.properties and let me know.

thanks, Vladimir

[vladimir dvorak]

Fixed in repository

[jpi...@live.com.au]

Cheers Vladimir. I didn't realise TOmcat 8 wasn't supported. Thank you for looking at it though.

On Saturday, 29 August 2015 06:20:41 UTC+10, vladimir dvorak wrote:

Fixed in repository

[vladimir dvorak]

Hi,
it was supported until 8.0.23. There was an internal api change in version 8.0.24, that caused this fail.
cheers, Vladimir

[Shadab Ambat]

Hi Vladimir just wanted to check if Tomcat 8 was supported now?
I downloaded the current dcevm and hotswap agent but getting this exception (using Tomcat 8.28)
HOTSWAP AGENT: 17:19:30.576 ERROR (org.hotswap.agent.annotation.handler.OnClassLoadedHandler) - InvocationTargetException in transform method on plugin 'class org.hotswap.agent.plugin.tomcat.TomcatPlugin' class 'org/apache/catalina/webresources/StandardRoot'

Would I need to downgrade to Tomcat 8.0.23 to get it to work?

thanks

[Shadab Ambat]

Hmm I tried with Tomcat 8.0.23 but that gave me the same error. It seems to be some other issue with the Hotswap agent
I noticed that the original poster was using 8.0.21 as well so they might be seeing a different problem too. Unless none of the Tomcat 8 versions work?

[vladimir dvorak]

You can use last version from repository (git clone) and build HA by (mvn package). According current (1/2016) stability:  plugins that were already in 0.3 are stable. According new plugins - these are activated only if you use appropriate framework (GAE, RESTeasy) , so there is no problem if you don't use them.