Question

在尝试加载Spring 4.3.8应用程序的应用程序上下文时，一直在EmptyVisitor类上获取ClassNotFoundException。我看到spring-asm在3.2中被内联到spring-core中，但如果我查看spring-core jar，那么有几个XXXVisitor类，但没有EmptyVisitor类。

示例代码非常简单。： - ）


FIELDS TERMINATED BY ',' 
ENCLOSED BY '"'
LINES TERMINATED BY '\n'
IGNORE 1 ROWS

使用此应用程序上下文：

public static void main(String[] args)
{
    ApplicationContext context = new ClassPathXmlApplicationContext("conf/basic/applicationContext.xml");
}

生成此异常：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
           http://www.springframework.org/schema/context
           http://www.springframework.org/schema/context/spring-context-4.3.xsd">

    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="removed" />
        <property name="url" value="<removed>" />
        <property name="username" value="<removed>" />
        <property name="password" value="<removed>" />
    </bean>

</beans>

这是maven配置：

Apr 29, 2017 12:37:47 PM org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@246b179d: startup date [Sat Apr 29 12:37:47 PDT 2017]; root of context hierarchy
Exception in thread "main" java.lang.NoClassDefFoundError: org/springframework/asm/commons/EmptyVisitor
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at org.springframework.context.support.AbstractRefreshableApplicationContext.customizeBeanFactory(AbstractRefreshableApplicationContext.java:218)
    at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:129)
    at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:467)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:397)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
    at greg.aws.rds.redshift.BdlisTest.main(BdlisTest.java:21)
Caused by: java.lang.ClassNotFoundException: org.springframework.asm.commons.EmptyVisitor
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 19 more

Answer 1

好吧，使用您的配置在Eclipse中执行项目提供了丰富的信息。鉴于你错过了一个至关重要的依赖，我不太确定你是如何达到为你编译的点的：

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>4.3.8.RELEASE</version>
    </dependency>

您的主要方法不应该编译 - org.springframework.context.ApplicationContext和org.springframework.context.support.ClassPathXmlApplicationContext都会带来spring-context。我的猜测是你已经将旧版本的Spring混合到你的运行时类路径中。

Eclipse Build Path Nesting Errors，我过去常常使用你的pom.xml来解决一个问题，你的项目可能已被＆＃34; mavenized＆＃34; - 作为常规Java项目开始，然后给出一个Maven方面。所以你也应该摆脱<sourceDirectory>src</sourceDirectory>。

在我解决了上述问题之后，我达到了MySQL数据源无法实例化的失败点，这表明我的asm错误比你的更远。

这是我的mvn dependency:tree：

 [INFO] test:testart:jar:0.0.1-SNAPSHOT
 [INFO] +- mysql:mysql-connector-java:jar:6.0.6:compile
 [INFO] +- org.springframework:spring-context:jar:4.3.8.RELEASE:compile
 [INFO] |  +- org.springframework:spring-aop:jar:4.3.8.RELEASE:compile
 [INFO] |  +- org.springframework:spring-beans:jar:4.3.8.RELEASE:compile
 [INFO] |  \- org.springframework:spring-expression:jar:4.3.8.RELEASE:compile
 [INFO] +- org.springframework:spring-core:jar:4.3.8.RELEASE:compile
 [INFO] |  \- commons-logging:commons-logging:jar:1.2:compile
 [INFO] +- org.springframework:spring-jdbc:jar:4.3.8.RELEASE:compile
 [INFO] |  \- org.springframework:spring-tx:jar:4.3.8.RELEASE:compile
 [INFO] \- org.projectlombok:lombok:jar:1.16.16:compile

spring-core 4.3.8缺少EmptyVisitor类？

1 个答案: