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After upgrading a project from spring boot1 to spring boot2, the following error was reported. Many different solutions were found but they were not solved:

An exception was encountered when the spring boot2 project started:

java.lang.ArrayStoreException: sun.reflect.annotation.TypeNotPresentExceptionProxy

Caused by: java.lang.ArrayStoreException: sun.reflect.annotation.TypeNotPresentExceptionProxy
    at sun.reflect.annotation.AnnotationParser.parseClassArray(AnnotationParser.java:724) ~[na:1.8.0_65]
    at sun.reflect.annotation.AnnotationParser.parseArray(AnnotationParser.java:531) ~[na:1.8.0_65]
    at sun.reflect.annotation.AnnotationParser.parseMemberValue(AnnotationParser.java:355) ~[na:1.8.0_65]
    at sun.reflect.annotation.AnnotationParser.parseAnnotation2(AnnotationParser.java:286) ~[na:1.8.0_65]
    at sun.reflect.annotation.AnnotationParser.parseAnnotations2(AnnotationParser.java:120) ~[na:1.8.0_65]
    at sun.reflect.annotation.AnnotationParser.parseAnnotations(AnnotationParser.java:72) ~[na:1.8.0_65]
    at java.lang.Class.createAnnotationData(Class.java:3521) ~[na:1.8.0_65]
    at java.lang.Class.annotationData(Class.java:3510) ~[na:1.8.0_65]
    at java.lang.Class.createAnnotationData(Class.java:3526) ~[na:1.8.0_65]
    at java.lang.Class.annotationData(Class.java:3510) ~[na:1.8.0_65]
    at java.lang.Class.getAnnotation(Class.java:3415) ~[na:1.8.0_65]
    at java.lang.reflect.AnnotatedElement.isAnnotationPresent(AnnotatedElement.java:258) ~[na:1.8.0_65]
    at java.lang.Class.isAnnotationPresent(Class.java:3425) ~[na:1.8.0_65]
    at org.springframework.core.annotation.AnnotatedElementUtils.hasAnnotation(AnnotatedElementUtils.java:570) ~[spring-core-5.0.9.RELEASE.jar:5.0.9.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping.isHandler(RequestMappingHandlerMapping.java:177) ~[spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
    at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.initHandlerMethods(AbstractHandlerMethodMapping.java:218) ~[spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
    at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.afterPropertiesSet(AbstractHandlerMethodMapping.java:189) ~[spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping.afterPropertiesSet(RequestMappingHandlerMapping.java:136) ~[spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1758) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1695) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
    ... 16 common frames omitted

After simple troubleshooting, it is suspected that the exception is caused by jar version conflict. Use exception breakpoint:

And then in the

It should be an error from class org.activiti.spring.boot.securityautoconfiguration, and then an error java.lang.arraystoreexception: sun.reflect.annotation.typenotpresentexceptionproxy

Attempt to reproduce exception:

SecurityAutoConfiguration securityAutoConfiguration=new SecurityAutoConfiguration();

Normal

SecurityAutoConfiguration.class.getDeclaredAnnotation(Aspect.class);

Abnormal recurrence

Then find the typenotpresentexceptionproxy class and use Ctrl + n/Ctrl + N + n

Then we break the points in the construction method

It was found that cause: defaultauthenticationeventpublisher could not find the error

The actual error is classnotfound

If you look at the code carefully, you can see that annotationparser. Parseclassvalue wraps the exception as object

private static Object parseClassValue(ByteBuffer buf,
                                          ConstantPool constPool,
                                          Class<?> container) {
        int classIndex = buf.getShort() & 0xFFFF;
        try {
            try {
                String sig = constPool.getUTF8At(classIndex);
                return parseSig(sig, container);
            } catch (IllegalArgumentException ex) {
                // support obsolete early jsr175 format class files
                return constPool.getClassAt(classIndex);
            }
        } catch (NoClassDefFoundError e) {
            return new TypeNotPresentExceptionProxy("[unknown]", e);
        }
        catch (TypeNotPresentException e) {
            return new TypeNotPresentExceptionProxy(e.typeName(), e.getCause());
        }
    }

Then in sun. Reflection. Annotation. Annotation parser. Parseclassarray (int, ByteBuffer, constantpool, class & lt>) and try to set it directly to the array

Here, the array is out of bounds, arraystoreexception only the type information of the out of bounds object , that is, the above

Solution:

1: Downgrade springboot 2.0 to the original 1. X version

2: Add the

@SpringBootApplication(exclude = SecurityAutoConfiguration.class)

3: Modify the source code integration problem, recompile

Conclusion:

Specific problems need to be analyzed in detail, and different codes have different causes

My question is:

Springboot2.0 can't be directly integrated with activiti6.0.0, because activiti6.0.0 didn't come out when it came out. Activiti6.0.0 supports versions above 2.2.6 and below 2.0.0

The actual error reported here is classnotfound