Spring plugin doesn't work on wildfly 12

[aekrylov]

I'm using hotswap agent 1.3.0 with Spring plugin enabled for war packaged web app on Wildfly 12. The agent is attached via the command line (i.e. -XXaltjvm=dcevm -javaagent:%JBOSS_HOME%\bin\webbpm-hotswap-agent.jar"). Classes are reloaded through JPDA. Core hotswap features work just fine, though the Spring plugin doesn't refresh components.
Spring is initialized through WebAppInitializers, with component scan enabled with annotations in config classes. I tried managed war and exploded deployments as well as unmanaged exploded deployment, neither of which works.
On the app startup, i see warnings like that in Wildfly logs:

HOTSWAP AGENT: 18:04:54.439 WARNING (org.hotswap.agent.watch.nio.TreeWatcherNIO) - Unable to watch for path vfs:/C:/jboss-home/standalone/data/managed-exploded/backend.war/WEB-INF/classes/service/, not a local regular file or directory.

Is there something else I should do to make the plugin work?

[aekrylov]

When using exploded deployments, I see following errors during the hotswap:

 HOTSWAP AGENT: 18:07:00.881 ERROR (org.hotswap.agent.util.signature.ClassSignatureComparerHelper) - Error reading siganture
 org.hotswap.agent.javassist.NotFoundException: lib_package.LibClass
 	at org.hotswap.agent.javassist.ClassPool.get(ClassPool.java:445)
 	at org.hotswap.agent.javassist.CtClassType.getSuperclass(CtClassType.java:780)
 	at org.hotswap.agent.util.signature.CtClassSignature.getValue(CtClassSignature.java:69)
	at org.hotswap.agent.util.signature.ClassSignatureComparerHelper.getCtClassSignature(ClassSignatureComparerHelper.java:21)
 	at org.hotswap.agent.util.signature.ClassSignatureComparerHelper.isDifferent(ClassSignatureComparerHelper.java:37)
 	at org.hotswap.agent.util.signature.ClassSignatureComparerHelper.isPoolClassDifferent(ClassSignatureComparerHelper.java:64)
 	at org.hotswap.agent.plugin.spring.signature.ClassSignatureComparer.isPoolClassDifferent(ClassSignatureComparer.java:31)
	at org.hotswap.agent.plugin.spring.SpringChangesAnalyzer.classChangeNeedsReload(SpringChangesAnalyzer.java:43)
 	at org.hotswap.agent.plugin.spring.SpringChangesAnalyzer.isReloadNeeded(SpringChangesAnalyzer.java:36)
 	at org.hotswap.agent.plugin.spring.SpringPlugin$1.transform(SpringPlugin.java:108)
	at org.hotswap.agent.util.HotswapTransformer.transform(HotswapTransformer.java:189)
 	at sun.instrument.TransformerManager.transform(TransformerManager.java:188)
 	at sun.instrument.InstrumentationImpl.transform(InstrumentationImpl.java:428)

The class in error is a superclass of a spring Component class being hotswapped, and is located in the jar under WEB-INF/lib