Spring 是否可以使用MyBatis的外部DAO jar/库？

我想制作一个由dao、域（java类）、映射器（xml）和mybatis-config.xml组成的jar。这样，多个项目可以包含jar，从而避免项目中重复的类

我制作了这个罐子，但出现了以下错误

当类、xml文件位于spring项目中而不是外部jar中时，它可以正常工作

ERROR [main] (org.springframework.test.context.TestContextManager:314) - Caught exception while allowing TestExecutionListener [org.springframework.test.context.web.ServletTestExecutionListener@472b82e5] to prepare test instance [com.ktnet.ca.web.controller.CmpControllerTest@799eace3]
java.lang.IllegalStateException: Failed to load ApplicationContext
    at org.springframework.test.context.CacheAwareContextLoaderDelegate.loadContext(CacheAwareContextLoaderDelegate.java:99)
    at org.springframework.test.context.TestContext.getApplicationContext(TestContext.java:122)
    at org.springframework.test.context.web.ServletTestExecutionListener.setUpRequestContextIfNecessary(ServletTestExecutionListener.java:154)
    at org.springframework.test.context.web.ServletTestExecutionListener.prepareTestInstance(ServletTestExecutionListener.java:100)
    at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:312)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:211)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:288)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:284)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:88)
    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:71)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [test-database-context.xml]: Invocation of init method failed; nested exception is java.lang.Error: Unresolved compilation problems: 
    The import com.test.ca.param cannot be resolved
    SearchParam cannot be resolved to a type
    SearchParam cannot be resolved to a type
    SearchParam cannot be resolved to a type

    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1512)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:521)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:296)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:293)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:610)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:932)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479)
    at org.springframework.test.context.web.AbstractGenericWebContextLoader.loadContext(AbstractGenericWebContextLoader.java:128)
    at org.springframework.test.context.web.AbstractGenericWebContextLoader.loadContext(AbstractGenericWebContextLoader.java:60)
    at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.delegateLoading(AbstractDelegatingSmartContextLoader.java:100)
    at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.loadContext(AbstractDelegatingSmartContextLoader.java:248)
    at org.springframework.test.context.CacheAwareContextLoaderDelegate.loadContextInternal(CacheAwareContextLoaderDelegate.java:64)
    at org.springframework.test.context.CacheAwareContextLoaderDelegate.loadContext(CacheAwareContextLoaderDelegate.java:91)

spring配置文件如下所示

    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"
        p:dataSource-ref="ca-ds" p:mapperLocations="classpath:/com/test/ca/mapper/*mapper.xml"
        p:configLocation="classpath:/com/test/ca/mybatis-config.xml" />

---

有人知道如何解决这个问题吗？

我不确定我是否正确理解了您的问题：

您在一个JAR文件中有映射器XML（在包

/com/test/ca/mapper/*mapper.XML

下），并且似乎查找失败

我相信是资源表达式

“classpath:/com/test/ca/mapper/*mapper.xml”

导致了这个问题。实际上，Spring在这里做了一个技巧来实现通配符。它将首先根据通配符之前的路径（即

/com/test/ca/mapper

）在类路径中查找资源。对于包含此类资源的第一个类路径元素（JAR等），它将使用该特定JAR搜索

*mapper.xml

因此，很可能您有另一个JAR，它有目录

/com/test/ca/mapper

，Spring“错误地”使用它来查找您的

*mapper.xml

---

解决方法很简单，改为使用

classpath*：

而不是

classpath:

。这将告诉Spring从所有类路径元素中查找，而不是从第一个遇到的类路径元素中查找。

由Spring导致的此问题无法扫描映射程序来执行DI。让添加组件扫描配置指向jar文件中的包。

无法解析import com.test.ca.param——SearchParam无法解析为类型

，但jar文件中存在包和类。当类、xml文件位于spring项目中而不是外部jar中时，它可以正常工作。

com.test.ca.param.SearchParam

是否确实位于类路径中？我尝试了类路径*，但没有成功。无论如何，谢谢你的描述，因为我不知道通配符的工作方式。