packagestoscan

Spring 2.5开始，通过component-scan和packagesToScan设置，实现对jar包和class文件的package层级的自动扫描，从而利用Annotation实现零配置。但在Eclipse RCP中，由于Eclipse的bundle原理，其bundle的jar包url为类似：bundleresource://269.fwk7214088/... ， 而Spring对jar和class文件的scan却只支持file的protocol，即url必须是类似：file:/F:/eclipse/.... 所以在Eclipse RCP中集成SpringFramework，并在spring配置文件中使用component-scan和packagesToScan设置时，这两个配置失效，并抛出异常：写道2010-11-12 16:21:17,843 PathMatchingResourcePatternResolver WARN - Cannot search for matching files underneath URL [bundleresource://269.fwk7214088/com/abc/efg/] because it does not correspond to a directory in the file systemjava.io.FileNotFoundException: URL [bundleresource://269.fwk7214088/com/abc/efg/] cannot be resolved to absolute file path because it does not reside in the file system: bundleresource://269.fwk7214088/com/abc/efg/at org.springframework.util.ResourceUtils.getFile(ResourceUtils.java:204)at org.springframework.core.io.AbstractFileResolvingResource.getFile(AbstractFileResolvingResource.java:51)at org.springframework.core.io.UrlResource.getFile(UrlResource.java:168)at org.springframework.core.io.support.PathMatchingResourcePatternResolver.doFindPathMatchingFileResources(PathMatchingResourcePatternResolver.java:530)at org.springframework.core.io.support.PathMatchingResourcePatternResolver.findPathMatchingResources(PathMatchingResourcePatternResolver.java:351)at org.springframework.core.io.support.PathMatchingResourcePatternResolver.getResources(PathMatchingResourcePatternResolver.java:269)at org.springframework.context.support.AbstractApplicationContext.getResources(AbstractApplicationContext.java:1196)at org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.findCandidateComponents(ClassPathScanningCandidateComponentProvider.java:204)at org.springframework.context.annotation.ClassPathBeanDefinitionScanner.doScan(ClassPathBeanDefinitionScanner.java:204)at org.springframework.context.annotation.ComponentScanBeanDefinitionParser.parse(ComponentScanBeanDefinitionParser.java:84)at org.springframework.beans.factory.xml.NamespaceHandlerSupport.parse(NamespaceHandlerSupport.java:73)at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1335)at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1325)at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:136)at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:93)at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions(XmlBeanDefinitionReader.java:493)at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:390)at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:334)at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:302)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.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:212)at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:126)at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:92)at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:130)at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:465)at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:395)at org.springframework.context.support.ClassPathXmlApplicationContext.(ClassPathXmlApplicationContext.java:139)at org.springframework.context.support.ClassPathXmlApplicationContext.(ClassPathXmlApplicationContext.java:83)在网上Google无果的情况下，只好把目标放到了：at org.springframework.util.ResourceUtils.getFile(ResourceUtils.java:204)打开org.springframework.core-sources-3.0.1.RELEASE-A中的源码包，查看ResourceUtils.java:204，发现其代码如下：Java代码if (!URL_PROTOCOL_FILE.equals(resourceUrl.getProtocol())) {throw new FileNotFoundException(description + " cannot be resolved to absolute file path " +"because it does not reside in the file system: " + esourceUrl);}如果在这段代码前，可以把bundleresource类型的package转换为file类型的package，问题就可以解决。于是在这段代码前增加相关转换处理：Java代码//Support Eclipse RCP bundle, Modify by AlexString protocol = resourceUrl.getProtocol();if(protocol.equals("bundleresource") || protocol.startsWith("bundle")) {try {resourceUrl = org.eclipse.core.runtime.Platform.resolve(resourceUrl);} catch(IOException e) {e.printStackTrace();}}if (!URL_PROTOCOL_FILE.equals(resourceUrl.getProtocol())) {throw new FileNotFoundException(description + " cannot be resolved to absolute file path " +"because it does not reside in the file system: " + resourceUrl);}编译后，把ResourceUtil.class替换到spring-core.jar中就可以了。值得注意的是，因为这里URL的转换使用了org.eclipse.core.runtime.Platform，所以spring-core.jar所在的bundle必须添加Dependencies ： org.eclipse.core.runtime当然了，因为这里的jar包是针对Eclipse 的RCP所用，所以这个应该也不是大问题