Mule Custom Transformer：没有用于元素定制变换器的类

问题描述 投票：1回答：4

我正在尝试创建一个简单的流，从HTTP端点获取字符串，使用自定义Java转换器更改它，然后将其发送回客户端。不幸的是，当我尝试运行流程时，Mule似乎无法找到或以其他方式使用我的自定义类。我的代码示例如下：

MyClass.java (the custom transformer class):

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 (the flow using the HTTP and custom transformer components):

<?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>

Error log:

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+ 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 contents (untouched, this is as it was generated by MuleStudio):

<?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自动放置它），src\main中的所有文件都包含在BuildPath设置中。

据我所知，为了使用自定义变压器，我已经完成了所需的一切。显然，我错过了一些东西。我该怎么做才能使我的定制变压器工作？

java mule esb mule-studio
4个回答
1
投票

如果你在mule studio中创建一个新的java类，你必须停止并开始获取更改，重新部署不会获得新的.java，或者至少它会对我产生影响。

0
投票

检查您使用的类名称：public class myClass（下m）和<custom-transformer class="myPackage.MyClass"（上M）。

您需要将变换器类声明更改为“myPackage.myClass”。

0
投票

我通过回滚到MuleStudio 3.4.0解决了这个问题。因此，我的安装3.4.1似乎是一个问题。

0
投票

您的代码不是由Studio编译因此错误。很多时候使用新创建的项目（来自Import ...）我发现自己很难找到为什么我的代码没有编译而Studio正在吐出奇怪的错误。我要检查的第一件事是“Java构建路径” - 右键单击​​您的项目。确保缺少jar或文件夹导致“Library”或“Source”中没有红色X.

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