【Maven问题】 错误: 程序包xxx 不存在 |
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今天编译maven的时候出现问题了 mvn clean compile [ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.3:compile (default-compile) on project iot_push_server: Compilation failure: Co mpilation failure: [ERROR] /D:/iot_push-master/iot_push_server/src/main/java/com/lxr/iot/bootstrap/BaseApi.java:[3,31] 程序包com.sun.istack.internal不存在 [ERROR] /D:/iot_push-master/iot_push_server/src/main/java/com/lxr/iot/bootstrap/BaseApi.java:[74,35] 找不到符号 [ERROR] 符号: 类 NotNull [ERROR] 位置: 接口 com.lxr.iot.bootstrap.BaseApi [ERROR] /D:/iot_push-master/iot_push_server/src/main/java/com/lxr/iot/bootstrap/BaseApi.java:[74,49] 找不到符号 [ERROR] 符号: 类 NotNull [ERROR] 位置: 接口 com.lxr.iot.bootstrap.BaseApi [ERROR] /D:/iot_push-master/iot_push_server/src/main/java/com/lxr/iot/bootstrap/BaseApi.java:[74,81] 找不到符号 [ERROR] 符号: 类 NotNull [ERROR] 位置: 接口 com.lxr.iot.bootstrap.BaseApi [ERROR] -> [Help 1] [ERROR] [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch. [ERROR] Re-run Maven using the -X switch to enable full debug logging. [ERROR] [ERROR] For more information about the errors and possible solutions, please read the following articles: [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException [ERROR] [ERROR] After correcting the problems, you can resume the build with the command [ERROR] mvn -rf :iot_push_server这里最关键的提示是: 程序包 com.sun.istack.internal 不存在我看了下ide，没有报错，可以点到com.sun.istack.internal这个包里面！ 这就有点麻烦了。 首先，大概猜下为啥这个包不存在 我们是在编译java文件的时候需要依赖这个包中的class，也就是mvn compile调用的编译程序的classpath中没有包含 com.sun.istack.internal这个包，而ide中却包含了这个包。而通过ide，我们观察到 com.sun.istack.internal这个包在 ${MAVEN_HOME}/jre/lib/rt.jar这个jar中，所以我们可以得出一个大致的结论： mvn compile调用的编译程序的classpath中缺少${MAVEN_HOME}/jre/lib/rt.jar 这个jar包 那么下一步，我们应该通过日志，去观察 mvn compile的编译程序所依赖的classpath 通过maven 命令，执行以下命令debug。 mvn compile -X -e控制台日志 [INFO] --- maven-compiler-plugin:3.3:compile (default-compile) @ iot_push_server --- [DEBUG] Configuring mojo org.apache.maven.plugins:maven-compiler-plugin:3.3:compile from plugin realm ClassRealm[plugin>org.apache.maven.plugins:maven-compiler -plugin:3.3, parent: sun.misc.Launcher$AppClassLoader@33909752] [DEBUG] Configuring mojo 'org.apache.maven.plugins:maven-compiler-plugin:3.3:compile' with basic configurator --> [DEBUG] (f) basedir = D:\iot_push-master\iot_push_server [DEBUG] (f) buildDirectory = D:\iot_push-master\iot_push_server\target [DEBUG] (f) classpathElements = [XXXXXXXX some jar XXXXXXXX] [DEBUG] (f) compileSourceRoots = [D:\iot_push-master\iot_push_server\src\main\java] [DEBUG] (f) compilerId = javac [DEBUG] (f) debug = true [DEBUG] (f) encoding = UTF-8 [DEBUG] (f) failOnError = true [DEBUG] (f) forceJavacCompilerUse = false [DEBUG] (f) fork = false [DEBUG] (f) generatedSourcesDirectory = D:\iot_push-master\iot_push_server\target\generated-sources\annotations [DEBUG] (f) mojoExecution = org.apache.maven.plugins:maven-compiler-plugin:3.3:compile {execution: default-compile} [DEBUG] (f) optimize = false [DEBUG] (f) outputDirectory = D:\iot_push-master\iot_push_server\target\classes [DEBUG] (f) project = MavenProject: com.lxr.iot:iot_push_server:1.0-SNAPSHOT @ D:\iot_push-master\iot_push_server\pom.xml [DEBUG] (f) projectArtifact = com.lxr.iot:iot_push_server:jar:1.0-SNAPSHOT [DEBUG] (f) session = org.apache.maven.execution.MavenSession@610db97e [DEBUG] (f) showDeprecation = false [DEBUG] (f) showWarnings = false [DEBUG] (f) skipMultiThreadWarning = false [DEBUG] (f) source = 1.8 [DEBUG] (f) staleMillis = 0 [DEBUG] (f) target = 1.8 [DEBUG] (f) useIncrementalCompilation = true [DEBUG] (f) verbose = false [DEBUG] -- end configuration -- [DEBUG] Using compiler 'javac'. （=======重要========） [DEBUG] Source directories: [D:\iot_push-master\iot_push_server\src\main\java] [DEBUG] Classpath: [D:\iot_push-master\iot_push_server\target\classes D:\iot_push-master\iot_push_common\target\classes , XXXXXXXX some jar XXXXXXXX] [DEBUG] Output directory: D:\iot_push-master\iot_push_server\target\classes [DEBUG] Adding D:\iot_push-master\iot_push_server\target\generated-sources\annotations to compile source roots: D:\iot_push-master\iot_push_server\src\main\java [DEBUG] New compile source roots: D:\iot_push-master\iot_push_server\src\main\java D:\iot_push-master\iot_push_server\target\generated-sources\annotations ... [DEBUG] Source roots: [DEBUG] D:\iot_push-master\iot_push_server\src\main\java [DEBUG] D:\iot_push-master\iot_push_server\target\generated-sources\annotations [DEBUG] Command line options:（=======重要========） [DEBUG] -d D:\iot_push-master\iot_push_server\target\classes -classpath XXXXXXXX some jar XXXXXXXX -sourcepath D:\iot_push-master\iot_push_server\src\main\java;D:\iot_push-master\iot_push_server\target\generated -sources\annotations; -s D:\iot_push-master\iot_push_server\target\generated-sources\annotations -g -nowarn -target 1.8 -source 1.8 -encoding UTF-8 [DEBUG] incrementalBuildHelper#beforeRebuildExecution [INFO] Compiling 31 source files to D:\iot_push-master\iot_push_server\target\classes [DEBUG] incrementalBuildHelper#afterRebuildExecution我们通过日志，发现两个很关键的内容 使用javac编译程序 [DEBUG] Using compiler 'javac'. javac的classpath参数不包含 jdk的lib文件中所包含的jar包 [DEBUG] Command line options: [DEBUG] -d D:\iot_push-master\iot_push_server\target\classes -classpath ... -sourcepath通过classpath,我们知道 javac会找两个的classpath，一个是系统环境变量 CLASSPATH,一个是参数 -classpath ，这里参数不包含classpath，那么必须在环境变量CLASSPATH 中寻找。 验证： 我们在window中查找classpath C:\Users\ezlhq> echo %classpath% .;D:\java\jdk1.8.0_152\lib\dt.jar;D:\java\jdk1.8.0_152\lib\tools.jar;对比 ide中的classpath 同时我们手动用javac 去编译类 C:\Users\ezlhq>javac -verbose D:\iot_push-master\iot_push_server\src\main\java\com\lxr\iot\bootstrap\BaseApi.java [解析开始时间 RegularFileObject[D:\iot_push-master\iot_push_server\src\main\java\com\lxr\iot\bootstrap\BaseApi.java]] [解析已完成, 用时 24 毫秒] [源文件的搜索路径: .,D:\java\jdk1.8.0_152\lib\dt.jar,D:\java\jdk1.8.0_152\lib\tools.jar] [类文件的搜索路径: xxxx果然验证了我们之前的答案。mvn调用javac去编译我们应用程序的时候，并没有带上 rt.jar这个jar包 那么如何解决这个问题了? window修改全局变量后还得重启才能生效，考虑到还有其他开发人员，不可能人人都重启电脑，故弃之 javac -classpath的时候加上 rt.jar 通过maven-compiler-plugin 插件使用修改pom：bootclasspath 参考 org.apache.maven.plugins maven-compiler-plugin 3.5.1 1.8 1.8 UTF-8 ${java.home}\lib\rt.jar;${java.home}\lib\jce.jar |
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