異常說明

使用Reflections掃描的時候出現could not create class file from, 原因是invalid constant type: 18

異常堆棧:

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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看了一篇文章說是 代碼中是用的解析字節碼的庫 既不兼容jdk1.8 甚至可能都不兼容jdk1.7, 如果編譯器沒問題，那問題就在這個解析字節碼的庫

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:

解決方案

由于Reflections解析字節碼使用了javassist庫， 換個版本試試，解決問題的版本javassist-3.18.2-GA，如果其他的庫有依賴javasist的，需要統一版本，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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掃描代碼：

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
http://blog.csdn.net/zxhoo/article/details/38387141

總結

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