Linux下java环境变量配置问题,解决 重新打开bash后JDK环境变量无效问题
Linux下java环境变量配置问题,解决 重新打开bash后JDK环境变量无效问题
equilibrium_sleeper 发表于6个月前
Linux下java环境变量配置问题,解决 重新打开bash后JDK环境变量无效问题
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Linux下配置JDK实际上是很简单的,我按照网上的教程进行如下配置,在 /etc/profile 文件中最后添加:

export JAVA_HOME=/home/son/jdk1.8.0_144
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$JAVA_HOME/bin:$PATH

通过命令启用java环境:

source /etc/profile

但是有一个问题比较恶心,那就是JDK环境变量失效的问题,

关闭设置好的bash后重新打开,java环境变量就无效了

root@ubuntu:/home/son/apache-tomcat-8.5.20/bin# ./shutdown.sh 
Neither the JAVA_HOME nor the JRE_HOME environment variable is defined
At least one of these environment variable is needed to run this program
root@ubuntu:/home/son/apache-tomcat-8.5.20/bin# java -version
bash: java: command not found

经大神指点, /etc/profile 文件修改一下,删除 export 就行。

JAVA_HOME=/home/son/jdk1.8.0_144
CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
PATH=$JAVA_HOME/bin:$PATH

需要再启用一下

source /etc/profile

再运行一下java

root@ubuntu:/etc# java
Usage: java [-options] class [args...]
           (to execute a class)
   or  java [-options] -jar jarfile [args...]
           (to execute a jar file)
where options include:
    -d32	  use a 32-bit data model if available
    -d64	  use a 64-bit data model if available
    -server	  to select the "server" VM
                  The default VM is server,
                  because you are running on a server-class machine.


    -cp <class search path of directories and zip/jar files>
    -classpath <class search path of directories and zip/jar files>
                  A : separated list of directories, JAR archives,
                  and ZIP archives to search for class files.
    -D<name>=<value>
                  set a system property
    -verbose:[class|gc|jni]
                  enable verbose output
    -version      print product version and exit
    -version:<value>
                  Warning: this feature is deprecated and will be removed
                  in a future release.
                  require the specified version to run
    -showversion  print product version and continue
    -jre-restrict-search | -no-jre-restrict-search
                  Warning: this feature is deprecated and will be removed
                  in a future release.
                  include/exclude user private JREs in the version search
    -? -help      print this help message
    -X            print help on non-standard options
    -ea[:<packagename>...|:<classname>]
    -enableassertions[:<packagename>...|:<classname>]
                  enable assertions with specified granularity
    -da[:<packagename>...|:<classname>]
    -disableassertions[:<packagename>...|:<classname>]
                  disable assertions with specified granularity
    -esa | -enablesystemassertions
                  enable system assertions
    -dsa | -disablesystemassertions
                  disable system assertions
    -agentlib:<libname>[=<options>]
                  load native agent library <libname>, e.g. -agentlib:hprof
                  see also, -agentlib:jdwp=help and -agentlib:hprof=help
    -agentpath:<pathname>[=<options>]
                  load native agent library by full pathname
    -javaagent:<jarpath>[=<options>]
                  load Java programming language agent, see java.lang.instrument
    -splash:<imagepath>
                  show splash screen with specified image
See http://www.oracle.com/technetwork/java/javase/documentation/index.html for more details.

OK!

 

 

 

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