21 lines
1.9 KiB
Markdown
21 lines
1.9 KiB
Markdown
### Problem
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When you start your application with the `skywalking` agent, you may find this exception in your agent log which means that `EnhanceRequireObjectCache` cannot be casted to `EnhanceRequireObjectCache`. For example:
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```java
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ERROR 2018-05-07 21:31:24 InstMethodsInter : class[class org.springframework.web.method.HandlerMethod] after method[getBean] intercept failure
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java.lang.ClassCastException: org.apache.skywalking.apm.plugin.spring.mvc.commons.EnhanceRequireObjectCache cannot be cast to org.apache.skywalking.apm.plugin.spring.mvc.commons.EnhanceRequireObjectCache
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at org.apache.skywalking.apm.plugin.spring.mvc.commons.interceptor.GetBeanInterceptor.afterMethod(GetBeanInterceptor.java:45)
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at org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.InstMethodsInter.intercept(InstMethodsInter.java:105)
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at org.springframework.web.method.HandlerMethod.getBean(HandlerMethod.java)
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at org.springframework.web.servlet.handler.AbstractHandlerMethodExceptionResolver.shouldApplyTo(AbstractHandlerMethodExceptionResolver.java:47)
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at org.springframework.web.servlet.handler.AbstractHandlerExceptionResolver.resolveException(AbstractHandlerExceptionResolver.java:131)
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at org.springframework.web.servlet.handler.HandlerExceptionResolverComposite.resolveException(HandlerExceptionResolverComposite.java:76)
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...
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```
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### Reason
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This exception may be caused by `hot deployment` tools (`spring-boot-devtool`) or otherwise, which changes the `classloader` in runtime.
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### Resolution
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1. This error does not occur under the production environment, since developer tools are automatically disabled: See [spring-boot-devtools](https://docs.spring.io/spring-boot/docs/2.4.x/reference/html/using-spring-boot.html#using-boot-devtools).
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2. If you would like to debug in your development environment as usual, you should temporarily remove such `hot deployment` package in your lib path.
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