jenkins构建java项目找不到命令mvn,java的解决方法

jenkins构建java项目时出现的报错情况：

$ mvn clean install

FATAL: command execution failed

java.io.IOException: error=2, No such file or directory

	at java.lang.UNIXProcess.forkAndExec(Native Method)

	at java.lang.UNIXProcess.<init>(UNIXProcess.java:247)

	at java.lang.ProcessImpl.start(ProcessImpl.java:134)

	at java.lang.ProcessBuilder.start(ProcessBuilder.java:1029)

Caused: java.io.IOException: Cannot run program "mvn" (in directory "/var/lib/jenkins/workspace/es"): error=2, No such file or directory

报错情况2：

/var/lib/jenkins/tools/hudson.tasks.Maven_MavenInstallation/maven_3.5.3/bin/mvn clean install

which: no java in (/var/lib/jenkins/tools/hudson.tasks.Maven_MavenInstallation/maven_3.5.3/bin:/sbin:/usr/sbin:/bin:/usr/bin)

The JAVA_HOME environment variable is not defined correctly

This environment variable is needed to run this program

NB: JAVA_HOME should point to a JDK not a JRE

Build step 'Invoke top-level Maven targets' marked build as failure

Finished: FAILURE

报错情况3：

[INFO] Changes detected - recompiling the module!

[INFO] Compiling 33 source files to /var/lib/jenkins/workspace/es/target/classes

[INFO] -------------------------------------------------------------

[ERROR] COMPILATION ERROR :

[INFO] -------------------------------------------------------------

[ERROR] No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?

[INFO] 1 error

[INFO] -------------------------------------------------------------

[INFO] ------------------------------------------------------------------------

[INFO] BUILD FAILURE

[INFO] ------------------------------------------------------------------------

[INFO] Total time: 02:42 min

[INFO] Finished at: 2018-05-29T18:32:22+08:00

[INFO] ------------------------------------------------------------------------

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.5.1:compile (default-compile) on project ruhnn-visual-search-background: Compilation failure

[ERROR] No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?

[ERROR]

[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

解决方法:

安装maven  并配置到jenkins配置里

下载地址  https://maven.apache.org/download.cgi

wget  http://mirror.bit.edu.cn/apache/maven/maven-3/3.5.2/binaries/apache-maven-3.5.2-bin.tar.gz

tar zxvf apache-maven-3.5.-bin.tar.gz

mv apache-maven-3.5. /usr/local/

/usr/loca/apache-maven-3.5./bin/mvn --version

jenkins -> 系统管理 -> 全局工具配置

Maven Configuration -> Settings file in filesystem -> File Path /usr/local/apache-maven-3.5./conf/settings.xml

Global settings file on filesystem -> File Path 同上

下拉到Maven，Maven安装，Name（自定义，如maven3.5.2），MAVEN_HOME填 “/usr/local/apache-maven-3.5.”

左下角“save”

安装maven 也可以参考：http://www.cnblogs.com/weifeng1463/p/8920765.html

安装jdk

jenkins -> 系统管理 -> 全局工具配置

JDK安装

JDK  别名  JDK1.

自动安装

          从java.sun.com 安装

          版本  Java SE Development Kit 8u162

最后测试可以成功构建：