ule子自定义变压器：元素自定义变压器没有类

Question

我正在尝试创建一个简单的流程，该流程从HTTP端点获取字符串，使用自定义Java转换器对其进行更改，然后将其发送回客户端。 不幸的是，当我尝试运行流时，Mule似乎无法找到或使用我的自定义类。 我的代码示例如下：

MyClass.java （自定义转换器类）：

package myPackage;

import org.mule.api.MuleMessage;
import org.mule.api.transformer.TransformerException;
import org.mule.transformer.AbstractMessageTransformer;

public class MyClass extends AbstractMessageTransformer {
    @Override
    public Object transformMessage(MuleMessage message, String outputEncoding) throws TransformerException {
        Object[] payload = new Object[] {"Payload has been modified"};

        message.setPayload(payload);

        return message;
    }
}

myFlow.mflow （使用HTTP和自定义转换器组件的流）：

<?xml version="1.0" encoding="UTF-8"?>

<mule xmlns:http="http://www.mulesoft.org/schema/mule/http" xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:doc="http://www.mulesoft.org/schema/mule/documentation" xmlns:spring="http://www.springframework.org/schema/beans" version="EE-3.4.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-current.xsd
http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd
http://www.mulesoft.org/schema/mule/http http://www.mulesoft.org/schema/mule/http/current/mule-http.xsd">
    <flow name="myFlow1" doc:name="myFlow1">
        <http:inbound-endpoint exchange-pattern="request-response" host="localhost" port="8081" doc:name="HTTP"/>
        <custom-transformer class="myPackage.MyClass" doc:name="Java"/>
    </flow>
</mule>

错误日志：

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+ New app 'myApp'                                          +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
INFO  2013-12-18 13:13:11,493 [main] org.mule.module.launcher.application.DefaultMuleApplication: 
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+ Initializing app 'myApp'                                 +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
INFO  2013-12-18 13:13:11,674 [main] org.mule.lifecycle.AbstractLifecycleManager: Initialising RegistryBroker
INFO  2013-12-18 13:13:11,797 [main] org.mule.config.spring.MuleApplicationContext: Refreshing org.mule.config.spring.MuleApplicationContext@28d9a0c1: startup date [Wed Dec 18 13:13:11 GMT 2013]; root of context hierarchy
ERROR 2013-12-18 13:13:12,700 [main] org.mule.config.spring.parsers.generic.ChildDefinitionParser: could not load class: myPackage.MyClass
java.lang.ClassNotFoundException: myPackage.MyClass
    at org.mule.util.ClassUtils.loadClass(ClassUtils.java:316)
    at org.mule.util.ClassUtils.loadClass(ClassUtils.java:212)
    at org.mule.config.spring.parsers.AbstractMuleBeanDefinitionParser.getBeanClassFromAttribute(AbstractMuleBeanDefinitionParser.java:382)
    at org.mule.config.spring.parsers.AbstractMuleBeanDefinitionParser.getClassInternal(AbstractMuleBeanDefinitionParser.java:345)
    at org.mule.config.spring.parsers.AbstractMuleBeanDefinitionParser.parseInternal(AbstractMuleBeanDefinitionParser.java:266)
    at org.mule.config.spring.parsers.AbstractMuleBeanDefinitionParser.muleParse(AbstractMuleBeanDefinitionParser.java:497)
    at org.mule.config.spring.parsers.delegate.AbstractParallelDelegatingDefinitionParser.muleParse(AbstractParallelDelegatingDefinitionParser.java:44)
    at org.mule.config.spring.parsers.delegate.AbstractDelegatingDefinitionParser.parseInternal(AbstractDelegatingDefinitionParser.java:61)
    at org.springframework.beans.factory.xml.AbstractBeanDefinitionParser.parse(AbstractBeanDefinitionParser.java:59)
    at org.springframework.beans.factory.xml.NamespaceHandlerSupport.parse(NamespaceHandlerSupport.java:73)
    at org.mule.config.spring.MuleHierarchicalBeanDefinitionParserDelegate.parseCustomElement(MuleHierarchicalBeanDefinitionParserDelegate.java:88)
    at org.mule.config.spring.MuleHierarchicalBeanDefinitionParserDelegate.parseCustomElement(MuleHierarchicalBeanDefinitionParserDelegate.java:130)
    at org.mule.config.spring.MuleHierarchicalBeanDefinitionParserDelegate.parseCustomElement(MuleHierarchicalBeanDefinitionParserDelegate.java:130)
    at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1428)
    at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:190)
    at org.mule.config.spring.MuleBeanDefinitionDocumentReader.parseBeanDefinitions(MuleBeanDefinitionDocumentReader.java:55)
    at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.doRegisterBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:140)
    at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:111)
    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:174)
    at org.mule.config.spring.MuleApplicationContext.loadBeanDefinitions(MuleApplicationContext.java:113)
    at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:130)
    at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:537)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:451)
    at org.mule.config.spring.SpringRegistry.doInitialise(SpringRegistry.java:89)
    at org.mule.registry.AbstractRegistry.initialise(AbstractRegistry.java:109)
    at org.mule.config.spring.SpringXmlConfigurationBuilder.createSpringRegistry(SpringXmlConfigurationBuilder.java:119)
    at org.mule.config.spring.SpringXmlConfigurationBuilder.doConfigure(SpringXmlConfigurationBuilder.java:73)
    at org.mule.config.builders.AbstractConfigurationBuilder.configure(AbstractConfigurationBuilder.java:46)
    at org.mule.config.builders.AbstractResourceConfigurationBuilder.configure(AbstractResourceConfigurationBuilder.java:78)
    at org.mule.config.builders.AutoConfigurationBuilder.autoConfigure(AutoConfigurationBuilder.java:101)
    at org.mule.config.builders.AutoConfigurationBuilder.doConfigure(AutoConfigurationBuilder.java:57)
    at org.mule.config.builders.AbstractConfigurationBuilder.configure(AbstractConfigurationBuilder.java:46)
    at org.mule.config.builders.AbstractResourceConfigurationBuilder.configure(AbstractResourceConfigurationBuilder.java:78)
    at org.mule.context.DefaultMuleContextFactory.createMuleContext(DefaultMuleContextFactory.java:84)
    at org.mule.module.launcher.application.DefaultMuleApplication.init(DefaultMuleApplication.java:207)
    at org.mule.module.launcher.application.ApplicationWrapper.init(ApplicationWrapper.java:64)
    at org.mule.module.launcher.DefaultMuleDeployer.deploy(DefaultMuleDeployer.java:47)
    at org.mule.tooling.server.application.ApplicationDeployer.main(ApplicationDeployer.java:127)
ERROR 2013-12-18 13:13:12,716 [main] org.mule.module.launcher.application.DefaultMuleApplication: null
java.lang.IllegalStateException: No class for element custom-transformer{name=Java}
    at org.mule.config.spring.parsers.AbstractMuleBeanDefinitionParser.getClassInternal(AbstractMuleBeanDefinitionParser.java:358)
    at org.mule.config.spring.parsers.AbstractMuleBeanDefinitionParser.parseInternal(AbstractMuleBeanDefinitionParser.java:266)
    at org.mule.config.spring.parsers.AbstractMuleBeanDefinitionParser.muleParse(AbstractMuleBeanDefinitionParser.java:497)
    at org.mule.config.spring.parsers.delegate.AbstractParallelDelegatingDefinitionParser.muleParse(AbstractParallelDelegatingDefinitionParser.java:44)
    at org.mule.config.spring.parsers.delegate.AbstractDelegatingDefinitionParser.parseInternal(AbstractDelegatingDefinitionParser.java:61)
    at org.springframework.beans.factory.xml.AbstractBeanDefinitionParser.parse(AbstractBeanDefinitionParser.java:59)
    at org.springframework.beans.factory.xml.NamespaceHandlerSupport.parse(NamespaceHandlerSupport.java:73)
    at org.mule.config.spring.MuleHierarchicalBeanDefinitionParserDelegate.parseCustomElement(MuleHierarchicalBeanDefinitionParserDelegate.java:88)
    at org.mule.config.spring.MuleHierarchicalBeanDefinitionParserDelegate.parseCustomElement(MuleHierarchicalBeanDefinitionParserDelegate.java:130)
    at org.mule.config.spring.MuleHierarchicalBeanDefinitionParserDelegate.parseCustomElement(MuleHierarchicalBeanDefinitionParserDelegate.java:130)
    at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1428)
    at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:190)
    at org.mule.config.spring.MuleBeanDefinitionDocumentReader.parseBeanDefinitions(MuleBeanDefinitionDocumentReader.java:55)
    at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.doRegisterBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:140)
    at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:111)
    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:174)
    at org.mule.config.spring.MuleApplicationContext.loadBeanDefinitions(MuleApplicationContext.java:113)
    at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:130)
    at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:537)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:451)
    at org.mule.config.spring.SpringRegistry.doInitialise(SpringRegistry.java:89)
    at org.mule.registry.AbstractRegistry.initialise(AbstractRegistry.java:109)
    at org.mule.config.spring.SpringXmlConfigurationBuilder.createSpringRegistry(SpringXmlConfigurationBuilder.java:119)
    at org.mule.config.spring.SpringXmlConfigurationBuilder.doConfigure(SpringXmlConfigurationBuilder.java:73)
    at org.mule.config.builders.AbstractConfigurationBuilder.configure(AbstractConfigurationBuilder.java:46)
    at org.mule.config.builders.AbstractResourceConfigurationBuilder.configure(AbstractResourceConfigurationBuilder.java:78)
    at org.mule.config.builders.AutoConfigurationBuilder.autoConfigure(AutoConfigurationBuilder.java:101)
    at org.mule.config.builders.AutoConfigurationBuilder.doConfigure(AutoConfigurationBuilder.java:57)
    at org.mule.config.builders.AbstractConfigurationBuilder.configure(AbstractConfigurationBuilder.java:46)
    at org.mule.config.builders.AbstractResourceConfigurationBuilder.configure(AbstractResourceConfigurationBuilder.java:78)
    at org.mule.context.DefaultMuleContextFactory.createMuleContext(DefaultMuleContextFactory.java:84)
    at org.mule.module.launcher.application.DefaultMuleApplication.init(DefaultMuleApplication.java:207)
    at org.mule.module.launcher.application.ApplicationWrapper.init(ApplicationWrapper.java:64)
    at org.mule.module.launcher.DefaultMuleDeployer.deploy(DefaultMuleDeployer.java:47)
    at org.mule.tooling.server.application.ApplicationDeployer.main(ApplicationDeployer.java:127)
INFO  2013-12-18 13:13:12,717 [main] org.mule.module.launcher.application.DefaultMuleApplication: App 'myApp' never started, nothing to dispose of
Exception in thread "main" org.mule.module.launcher.DeploymentInitException: IllegalStateException: No class for element custom-transformer{name=Java}
    at org.mule.module.launcher.application.DefaultMuleApplication.init(DefaultMuleApplication.java:219)
    at org.mule.module.launcher.application.ApplicationWrapper.init(ApplicationWrapper.java:64)
    at org.mule.module.launcher.DefaultMuleDeployer.deploy(DefaultMuleDeployer.java:47)
    at org.mule.tooling.server.application.ApplicationDeployer.main(ApplicationDeployer.java:127)
Caused by: org.mule.api.config.ConfigurationException: Unexpected exception parsing XML document from URL [file:/C:/mulestudio-3.5/workspace/.mule/apps/myApp/myApp.xml]; nested exception is java.lang.IllegalStateException: No class for element custom-transformer{name=Java} (org.mule.api.lifecycle.InitialisationException) (org.mule.api.config.ConfigurationException)
    at org.mule.config.builders.AbstractConfigurationBuilder.configure(AbstractConfigurationBuilder.java:52)
    at org.mule.config.builders.AbstractResourceConfigurationBuilder.configure(AbstractResourceConfigurationBuilder.java:78)
    at org.mule.context.DefaultMuleContextFactory.createMuleContext(DefaultMuleContextFactory.java:84)
    at org.mule.module.launcher.application.DefaultMuleApplication.init(DefaultMuleApplication.java:207)
    ... 3 more
Caused by: org.mule.api.config.ConfigurationException: Unexpected exception parsing XML document from URL [file:/C:/mulestudio-3.5/workspace/.mule/apps/myApp/myApp.xml]; nested exception is java.lang.IllegalStateException: No class for element custom-transformer{name=Java} (org.mule.api.lifecycle.InitialisationException)
    at org.mule.config.builders.AbstractConfigurationBuilder.configure(AbstractConfigurationBuilder.java:52)
    at org.mule.config.builders.AbstractResourceConfigurationBuilder.configure(AbstractResourceConfigurationBuilder.java:78)
    at org.mule.config.builders.AutoConfigurationBuilder.autoConfigure(AutoConfigurationBuilder.java:101)
    at org.mule.config.builders.AutoConfigurationBuilder.doConfigure(AutoConfigurationBuilder.java:57)
    at org.mule.config.builders.AbstractConfigurationBuilder.configure(AbstractConfigurationBuilder.java:46)
    ... 6 more
Caused by: org.mule.api.lifecycle.InitialisationException: Unexpected exception parsing XML document from URL [file:/C:/mulestudio-3.5/workspace/.mule/apps/myApp/myApp.xml]; nested exception is java.lang.IllegalStateException: No class for element custom-transformer{name=Java}
    at org.mule.registry.AbstractRegistry.initialise(AbstractRegistry.java:117)
    at org.mule.config.spring.SpringXmlConfigurationBuilder.createSpringRegistry(SpringXmlConfigurationBuilder.java:119)
    at org.mule.config.spring.SpringXmlConfigurationBuilder.doConfigure(SpringXmlConfigurationBuilder.java:73)
    at org.mule.config.builders.AbstractConfigurationBuilder.configure(AbstractConfigurationBuilder.java:46)
    ... 10 more
Caused by: org.springframework.beans.factory.BeanDefinitionStoreException: Unexpected exception parsing XML document from URL [file:/C:/mulestudio-3.5/workspace/.mule/apps/myApp/myApp.xml]; nested exception is java.lang.IllegalStateException: No class for element custom-transformer{name=Java}
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:412)
    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:174)
    at org.mule.config.spring.MuleApplicationContext.loadBeanDefinitions(MuleApplicationContext.java:113)
    at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:130)
    at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:537)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:451)
    at org.mule.config.spring.SpringRegistry.doInitialise(SpringRegistry.java:89)
    at org.mule.registry.AbstractRegistry.initialise(AbstractRegistry.java:109)
    ... 13 more
Caused by: java.lang.IllegalStateException: No class for element custom-transformer{name=Java}
    at org.mule.config.spring.parsers.AbstractMuleBeanDefinitionParser.getClassInternal(AbstractMuleBeanDefinitionParser.java:358)
    at org.mule.config.spring.parsers.AbstractMuleBeanDefinitionParser.parseInternal(AbstractMuleBeanDefinitionParser.java:266)
    at org.mule.config.spring.parsers.AbstractMuleBeanDefinitionParser.muleParse(AbstractMuleBeanDefinitionParser.java:497)
    at org.mule.config.spring.parsers.delegate.AbstractParallelDelegatingDefinitionParser.muleParse(AbstractParallelDelegatingDefinitionParser.java:44)
    at org.mule.config.spring.parsers.delegate.AbstractDelegatingDefinitionParser.parseInternal(AbstractDelegatingDefinitionParser.java:61)
    at org.springframework.beans.factory.xml.AbstractBeanDefinitionParser.parse(AbstractBeanDefinitionParser.java:59)
    at org.springframework.beans.factory.xml.NamespaceHandlerSupport.parse(NamespaceHandlerSupport.java:73)
    at org.mule.config.spring.MuleHierarchicalBeanDefinitionParserDelegate.parseCustomElement(MuleHierarchicalBeanDefinitionParserDelegate.java:88)
    at org.mule.config.spring.MuleHierarchicalBeanDefinitionParserDelegate.parseCustomElement(MuleHierarchicalBeanDefinitionParserDelegate.java:130)
    at org.mule.config.spring.MuleHierarchicalBeanDefinitionParserDelegate.parseCustomElement(MuleHierarchicalBeanDefinitionParserDelegate.java:130)
    at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1428)
    at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:190)
    at org.mule.config.spring.MuleBeanDefinitionDocumentReader.parseBeanDefinitions(MuleBeanDefinitionDocumentReader.java:55)
    at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.doRegisterBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:140)
    at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:111)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions(XmlBeanDefinitionReader.java:493)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:390)
    ... 22 more

.classpath内容（未修改，这是由MuleStudio生成的）：

<?xml version="1.0" encoding="UTF-8"?>
<classpath>
    <classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.7"/>
    <classpathentry exported="true" kind="con" path="MULE_RUNTIME"/>
    <classpathentry kind="src" path="src/main/java"/>
    <classpathentry kind="src" path="src/main/resources"/>
    <classpathentry kind="src" output="target/test-classes" path="src/test/java"/>
    <classpathentry kind="src" output="target/test-classes" path="src/test/resources"/>
    <classpathentry kind="output" path="target/classes"/>
</classpath>

MyClass.java位于C:\\mulestudio-3.5\\workspace\\myApp\\src\\main\\java\\myPackage\\MyClass.java （MuleStudio自动放置在其中），并且src\\main中的所有文件都包含在BuildPath设置中。

据我所知，我已经完成了使用自定义转换器所需的一切。 显然，我错过了一些东西。 如何使我的定制变压器正常工作？

Answer 1

如果您在Mule Studio中创建新的Java类，则必须停止并开始获取更改，重新部署不会获得新的.java，或者至少是我发生的。

Answer 2

检查您要使用的类名称的大小写： public class myClass （小写m）和<custom-transformer class="myPackage.MyClass" （大写M）。

您需要将转换器类声明更改为“ myPackage.myClass”。

Answer 3

我通过回滚到MuleStudio 3.4.0解决了此问题。 因此，对于我的3.4.1安装，这似乎是一个问题。

Answer 4

Studio未编译您的代码，因此出现错误。 很多次使用新创建的项目（来自Import ...），我都陷入了困境，以寻找为什么我的代码无法编译以及Studio吐出奇怪的错误的原因。 我要检查的第一件事是“ Java构建路径”-右键单击您的项目。 确保您的“库”或“源”中没有由于缺少jar或文件夹而引起的红色X。