如何确定哪里使用到了 org.json.simple.JSONObject

ltolll 2018-07-09 12:47:30

在开发机上tomcat正常启动.
整个工程用户定义类中都没有用到json.simple.
工程放到服务器上tomcat启动失败, 查日志:



09-Jul-2018 08:00:59.197 SEVERE [Catalina-startStop-1] org.apache.catalina.core.ContainerBase.startInternal A child container failed during start

 java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/pb4]]

	at java.util.concurrent.FutureTask.report(FutureTask.java:122)

	at java.util.concurrent.FutureTask.get(FutureTask.java:192)

	at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:917)

	at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:871)

	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)

	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1409)

	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1399)

	at java.util.concurrent.FutureTask.run(FutureTask.java:266)

	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

	at java.lang.Thread.run(Thread.java:745)

Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/pb4]]

	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)

	... 6 more

Caused by: java.lang.NoClassDefFoundError: org/json/simple/JSONObject

	at java.lang.Class.getDeclaredMethods0(Native Method)

	at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)

	at java.lang.Class.getDeclaredMethods(Class.java:1975)

	at org.apache.catalina.util.Introspection.getDeclaredMethods(Introspection.java:127)

	at org.apache.catalina.startup.WebAnnotationSet.loadMethodsAnnotation(WebAnnotationSet.java:273)

	at org.apache.catalina.startup.WebAnnotationSet.loadApplicationServletAnnotations(WebAnnotationSet.java:133)

	at org.apache.catalina.startup.WebAnnotationSet.loadApplicationAnnotations(WebAnnotationSet.java:65)

	at org.apache.catalina.startup.ContextConfig.applicationAnnotationsConfig(ContextConfig.java:334)

	at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:774)

	at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:305)

	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)

	at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)

	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5065)

	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)

	... 6 more

Caused by: java.lang.ClassNotFoundException: org.json.simple.JSONObject

	at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1305)

	at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1157)

	... 20 more

日志中"... 6 more", "... 20 more"应该是重要信息, 但是没显示出来.
在工程中使用全局查找"simple"没有找到.
如何定位错误?

...全文

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ltolll 2018-07-25

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gradle生成war文件的时候采用旧的类(其中引用了json.simple). 还是gradle没有搞好, 直接手工复制新的class

maradona1984 2018-07-09

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看看依赖树吧,或许存在providedCompile吧...

ltolll 2018-07-09

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引用 3 楼 maradona1984 的回复:

[quote=引用 2 楼 ltolll 的回复:]
[quote=引用 1 楼 qq593467574 的回复:]
你项目里应该是引用了JSON.simple 的jar包

已经确认多次,没有引用JSON.simple, 而且上文说了, 全局搜索(Ctrl+H)"simple"无结果.

假设说我真的引用了JSON.simple, 我要怎么把它找到呢?[/quote]

这个错就是因为你没有导入这个jar,你导入之后有可能就好了
你代码没用到不代表你依赖的jar里没用到
这也是maven解决以前工程依赖的一个痛点[/quote]

我的工程就是通过Gradle管理依赖的, 如果JSON.simple被依赖肯定会被下载吧?
build.gradle如下:



/*

 * pb v4.0开始使用Gradle构建

 */



// web 工程的插件

apply plugin: 'war'

apply plugin: 'eclipse-wtp'



tasks.withType(JavaCompile){

    options.encoding = "UTF-8"

}



repositories {

  maven { url 'http://maven.aliyun.com/nexus/content/groups/public/' }

  // 从jcenter仓库下载依赖包

  jcenter()

}



dependencies {

    compile group: 'org.apache.tomcat', name: 'tomcat-servlet-api', version: '8.0.48'

    compile group: 'org.apache.tomcat', name: 'tomcat-jsp-api', version: '8.0.48'



    compile group: 'org.apache.poi', name: 'poi', version: '3.17'



    // https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml

    compile group: 'org.apache.poi', name: 'poi-ooxml', version: '3.17'



    compile 'javax.servlet:javax.servlet-api:3.1.0'



  compile group: 'com.google.code.gson', name: 'gson', version: '2.8.2'

  

  // 用于压缩图片

  compile group: 'net.coobird', name: 'thumbnailator', version: '0.4.8'



  compile group: 'commons-logging', name: 'commons-logging', version: '1.2'

  

  compile group: 'org.mariadb.jdbc', name: 'mariadb-java-client', version: '2.2.1'

  

}