jdk1.8 和spring 2.5.5 兼容性问题

来源：互联网发布：淘宝众筹万创中国编辑：程序博客网时间：2024/06/07 11:29

先看异常：

nested exception is java.lang.ArrayIndexOutOfBoundsException: 9578 at org.springframework.beans.factory.parsing.FailFastProblemReporter.error(FailFastProblemReporter.java:68) at org.springframework.beans.factory.parsing.ReaderContext.error(ReaderContext.java:85) at org.springframework.beans.factory.parsing.ReaderContext.error(ReaderContext.java:76) at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.importBeanDefinitionResource(DefaultBeanDefinitionDocumentReader.java:182) at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseDefaultElement(DefaultBeanDefinitionDocumentReader.java:147) at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:132) at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:92) at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions(XmlBeanDefinitionReader.java:507) at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:398) at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:342) at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:310) at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:143) at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:178) at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:149) at org.springframework.web.context.support.XmlWebApplicationContext.loadBeanDefinitions(XmlWebApplicationContext.java:124) at org.springframework.web.context.support.XmlWebApplicationContext.loadBeanDefinitions(XmlWebApplicationContext.java:92) at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:123) at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:423) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:353) at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:255) at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:199) at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:45)

由于工程中配置了扫描jar包，类比较多，不好定位，我在本地实现的测试，代码如下：

public class MyMetadataReader implements MetadataReader {    private final ClassReader classReader;    private final ClassLoader classLoader;    public MyMetadataReader(ClassReader classReader, ClassLoader classLoader) {        this.classReader = classReader;        this.classLoader = classLoader;    }    public ClassMetadata getClassMetadata() {        ClassMetadataReadingVisitor visitor = new ClassMetadataReadingVisitor();        this.classReader.accept(visitor, true);        return visitor;    }    public AnnotationMetadata getAnnotationMetadata() {        AnnotationMetadataReadingVisitor visitor = new AnnotationMetadataReadingVisitor(this.classLoader);        this.classReader.accept(visitor, true);        return visitor;    }}

测试：

ClassReader reader = new ClassReader(in);                       MetadataReader metadataReader = new MyMetadataReader( reader, classLoader);                       metadataReader.getAnnotationMetadata();

最终获取了这个读取错误的class文件，发现，里面使用了java8的 lambda表达式特性

firstElements.forEach(e -> root.add(e.addAttribute("class","1").detach()));            secondElements.forEach(e -> root.add(e.addAttribute("class","2").detach()));            thirdElements.forEach(e -> root.add(e.addAttribute("class","3").detach()));

ClassReader 这个类在spring4.X中重写了，不禁要问，如果spring不升级到4.x，难道真的无法使用java8 新特性？如果是这样的话，真是个好大的坑！

经过测试，在Spring 2.5.5 使用注解扫描时，会使用到类ComponentScanBeanDefinitionParser中的方法，进而会调用 ClassReader中的方法，则Spring无法正常初始化。

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