[英]Class not found of apache commons - after jar is added
I have created a project which uses apache commons validations.I have tested it as a project and every thing worked as expected. 我创建了一个使用apache commons验证的项目。我已经将其作为一个项目进行了测试,并且一切正常。
Then, I have created a jar file of this project. 然后,我创建了该项目的jar文件。 I have checked that the apache commons validations jar is also compiled and added (as an dependency) to the jar I am building. 我已经检查过是否已编译apache commons验证jar,并将其添加(作为依赖项)到我正在构建的jar中。
Then, I have included this jar (with maven) to other project, and BANG an error!!! 然后,我已经将此罐子(与Maven一起)包含到其他项目中,并且发出错误提示!!! here it is: 这里是:
java.lang.NoClassDefFoundError: org/apache/commons/validator/routines/EmailValidator
What did I do wrong? 我做错了什么?
Here is the stacktrace: 这是堆栈跟踪:
Jan 21, 2014 3:20:45 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [com.evappserver.servlets.RegistrationServlet] in context with path [] threw exception [Servlet execution threw an exception] with root cause
java.lang.NoClassDefFoundError: org/apache/commons/validator/routines/EmailValidator
at com.evappcom.validator.Validator.emailValidator(Validator.java:29)
at com.evapp.protocols.BaseProtocol.emailValidation(BaseProtocol.java:124)
at com.evapp.protocols.RegistrationProtocol.validateRequest(RegistrationProtocol.java:57)
at com.evappserver.logiclayer.RegistrationLogic.registrateUser(RegistrationLogic.java:27)
at com.evappserver.servlets.RegistrationServlet.doGet(RegistrationServlet.java:38)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:722)
Here is the pom file: 这是pom文件:
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>EvApp_Server</groupId>
<artifactId>EvApp_Server</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<build>
<sourceDirectory>src</sourceDirectory>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
<plugin>
<artifactId>maven-war-plugin</artifactId>
<version>2.3</version>
<configuration>
<warSourceDirectory>WebContent</warSourceDirectory>
<failOnMissingWebXml>false</failOnMissingWebXml>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<dependency>
<groupId>org.json</groupId>
<artifactId>json</artifactId>
<version>20090211</version>
</dependency>
<dependency>
<groupId>oro</groupId>
<artifactId>oro</artifactId>
<version>2.0.8</version>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.0-alpha4</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency>
<dependency>
<groupId>com.evapp.code</groupId>
<artifactId>evappcom</artifactId>
<version>1.0</version>
</dependency>
</dependencies>
</project>
Here is the maven tree screenshot: 这是Maven树的屏幕截图:
Here is the included maven dependencies (with my custom jar): 这是包含的Maven依赖项(使用我的自定义jar):
在我看来,“其他”项目已经具有该apache依赖关系,并且该特定版本没有EmailValidator类。
Here is what I did to solve the problem. 这是我为解决问题所做的工作。 I don't know if it is the right way (I will stick to it until I find a better one). 我不知道这是否是正确的方法(我会坚持下去,直到找到更好的方法为止)。
I have changed the project from which I created the jar to maven, then I exported it to jar without the dependency of the apache common validations. 我将创建jar的项目更改为maven,然后将其导出到jar,而没有apache通用验证的依赖。 After installing it to my local repository and adding it to my main project I have added the dependency of the jar and apache common validations. 将其安装到本地存储库并将其添加到我的主项目后,我添加了jar和apache常见验证的依赖项。
From here every thing worked. 从这里开始,所有事情都起作用了。
I think it is not a good solution because it breaks the encapsulation idea of OOP. 我认为这不是一个好的解决方案,因为它破坏了OOP的封装思想。 It is possible to do the export of the jar from maven with all the dependency but as I know it may cause conflict errors of the dependencies when it is added to other project with the same dependencies. 可以使用所有依赖项从maven导出jar,但是据我所知,当将其添加到具有相同依赖项的其他项目中时,可能会导致依赖项的冲突错误。
I will glad to hear a better solutions :) 我很高兴听到更好的解决方案:)
您需要下载Apache Commons / Lang并确保它包含在CLASSPATH中(或者,如果使用IDE,请确保所有必需的库都包含在构建配置中)。
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