Reflections - Java 8 - invalid constant type

异常说明

使用Reflections扫描的时候出现could not create class file from, 原因是invalid constant type: 18

异常堆栈:

org.reflections.ReflectionsException: could not create class file from EmployeeDao.class
    at org.reflections.adapters.JavassistAdapter.getOfCreateClassObject(JavassistAdapter.java:102)
    at org.reflections.adapters.JavassistAdapter.getOfCreateClassObject(JavassistAdapter.java:24)
    at org.reflections.scanners.AbstractScanner.scan(AbstractScanner.java:30)
    at org.reflections.Reflections.scan(Reflections.java:250)
    at org.reflections.Reflections.scan(Reflections.java:204)
    at org.reflections.Reflections.<init>(Reflections.java:129)
    at org.reflections.Reflections.<init>(Reflections.java:170)
    at org.reflections.Reflections.<init>(Reflections.java:143)
    at com.mljr.fenqi.crm.core.cache.RedisCacheConfig.parseRedisCacheTTL(RedisCacheConfig.java:63)
    at com.mljr.fenqi.crm.core.cache.RedisCacheConfig.onApplicationEvent(RedisCacheConfig.java:40)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:163)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:136)
    at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:381)
    at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:335)
    at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:855)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:541)
    at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:125)
    at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:60)
    at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.delegateLoading(AbstractDelegatingSmartContextLoader.java:109)
    at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.loadContext(AbstractDelegatingSmartContextLoader.java:261)
    at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:98)
    at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:116)
    at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:83)
    at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:117)
    at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:83)
    at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:228)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:230)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:289)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:291)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:249)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:89)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
    at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
    at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:193)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:160)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:119)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:42)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:234)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:74)
Caused by: java.io.IOException: invalid constant type: 18
    at javassist.bytecode.ConstPool.readOne(ConstPool.java:1113)
    at javassist.bytecode.ConstPool.read(ConstPool.java:1056)
    at javassist.bytecode.ConstPool.<init>(ConstPool.java:150)
    at javassist.bytecode.ClassFile.read(ClassFile.java:765)
    at javassist.bytecode.ClassFile.<init>(ClassFile.java:109)
    at org.reflections.adapters.JavassistAdapter.getOfCreateClassObject(JavassistAdapter.java:100)
    ... 45 more

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看了一篇文章说是 代码中是用的解析字节码的库 既不兼容jdk1.8 甚至可能都不兼容jdk1.7, 如果编译器没问题，那问题就在这个解析字节码的库

If you look at this table, you’ll see that “constant type: 18” refers to the CONSTANT_InvokeDynamic attribute whose tag value is 18.

So you are using a library which has a class parser which is not Java 8 compatible. Actually, this class parser even isn’t Java 7 compatible as this constant value is specified since Java 7. It just got away with that as ordinary Java code doesn’t use this feature in Java 7. But when interacting with code produced by different programming languages for the JVM, it could even fail with Java 7.

There’s an item in the bug tracker of Reflections describing your problem. At the bottom, you will find the notice:

解决方案

由于Reflections解析字节码使用了javassist库， 换个版本试试，解决问题的版本 javassist-3.18.2-GA，如果其他的库有依赖javasist的，需要统一版本，就需要exclusion

pom.xml

<dependency>
    <groupId>org.reflections</groupId>
    <artifactId>reflections</artifactId>
    <version>0.9.10</version>
    <exclusions>
        <exclusion>
            <groupId>javassist</groupId>
            <artifactId>javassist</artifactId>
        </exclusion>
    </exclusions>
</dependency>
<dependency>
    <groupId>org.javassist</groupId>
    <artifactId>javassist</artifactId>
    <version>3.18.2-GA</version>
</dependency>

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扫描代码：

Map<String, Long> map = new HashMap<>();

ConfigurationBuilder builder = new ConfigurationBuilder()
        .filterInputsBy(new FilterBuilder().includePackage("com.mljr.fenqi.crm"))
        .addUrls(ClasspathHelper.forPackage("com.mljr"))
        .setScanners(new MethodAnnotationsScanner(), new TypeAnnotationsScanner(), new TypeElementsScanner(), new SubTypesScanner());

Reflections reflections = new Reflections(builder);

Set<Class<?>> annotated = reflections.getTypesAnnotatedWith(RedisCache.class);
for (Class<?> serviceClass : annotated) {
    RedisCache typeRedisCache = serviceClass.getAnnotation(RedisCache.class);
    if (typeRedisCache != null ) {
        for (String name : typeRedisCache.cacheNames()) {
            map.put(name, typeRedisCache.expire());
        }
    }
}

Set<Method> annotatedMethod = reflections.getMethodsAnnotatedWith(RedisCache.class);
for (Method method : annotatedMethod) {
    RedisCache methodRedisCache = method.getAnnotation(RedisCache.class);
    if (methodRedisCache != null ) {
        for (String name : methodRedisCache.cacheNames()) {
            map.put(name, methodRedisCache.expire());
        }
    }
}

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REF

• http://stackoverflow.com/questions/30313255/reflections-java-8-invalid-constant-type
• https://docs.oracle.com/javase/specs/jvms/se7/html/jvms-4.html#jvms-4.4.10
• http://blog.csdn.net/zxhoo/article/details/38387141