解决 “Neither the JAVA_HOME nor the JRE_HOME environment variable is defined” 的问题通常涉及到在你的操作系统中设置环境变量。这个错误通常在尝试运行依赖于Java的应用程序,如Apache Tomcat服务器时出现。下面是针对不同操作系统的解决方法:
JAVA_HOME
。C:\Program Files\Java\jdk-11.0.1
(根据你的实际安装路径调整)。%JAVA_HOME%\bin
。安装Java:
brew install java
,在Ubuntu上使用 sudo apt-get install default-jdk
。设置JAVA_HOME环境变量:
打开你的终端。
编辑你的profile文件,如 ~/.bash_profile
, ~/.zshrc
, 或 ~/.bashrc
(这取决于你使用的shell)。
添加以下行:
export JAVA_HOME=$(/usr/libexec/java_home)
export PATH=$JAVA_HOME/bin:$PATH
保存并关闭文件。
执行 source ~/.bash_profile
(或相应的文件名),以应用更改。
重新加载或打开新的终端窗口,以确保环境变量生效。
java -version
和 echo $JAVA_HOME
(Windows中使用 echo %JAVA_HOME%
)来验证Java版本和JAVA_HOME变量是否正确设置。如果在完成这些步骤后,你仍然遇到问题,可能需要检查你的Java安装或重新启动计算机。
@echo off
rem Licensed to the Apache Software Foundation (ASF) under one or more
rem contributor license agreements. See the NOTICE file distributed with
rem this work for additional information regarding copyright ownership.
rem The ASF licenses this file to You under the Apache License, Version 2.0
rem (the "License"); you may not use this file except in compliance with
rem the License. You may obtain a copy of the License at
rem
rem http://www.apache.org/licenses/LICENSE-2.0
rem
rem Unless required by applicable law or agreed to in writing, software
rem distributed under the License is distributed on an "AS IS" BASIS,
rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
rem See the License for the specific language governing permissions and
rem limitations under the License.
rem ---------------------------------------------------------------------------
rem Set JAVA_HOME or JRE_HOME if not already set, ensure any provided settings
rem are valid and consistent with the selected start-up options and set up the
rem endorsed directory.
rem ---------------------------------------------------------------------------
rem Make sure prerequisite environment variables are set
rem In debug mode we need a real JDK (JAVA_HOME)
if ""%1"" == ""debug"" goto needJavaHome
rem Otherwise either JRE or JDK are fine
if not "%JRE_HOME%" == "" goto gotJreHome
if not "%JAVA_HOME%" == "" goto gotJavaHome
echo Neither the JAVA_HOME nor the JRE_HOME environment variable is defined
echo At least one of these environment variable is needed to run this program
goto exit
:needJavaHome
rem Check if we have a usable JDK
if "%JAVA_HOME%" == "" goto noJavaHome
if not exist "%JAVA_HOME%\bin\java.exe" goto noJavaHome
if not exist "%JAVA_HOME%\bin\jdb.exe" goto noJavaHome
if not exist "%JAVA_HOME%\bin\javac.exe" goto noJavaHome
set "JRE_HOME=%JAVA_HOME%"
goto okJava
:noJavaHome
echo The JAVA_HOME environment variable is not defined correctly.
echo It is needed to run this program in debug mode.
echo NB: JAVA_HOME should point to a JDK not a JRE.
goto exit
:gotJavaHome
rem No JRE given, use JAVA_HOME as JRE_HOME
set "JRE_HOME=%JAVA_HOME%"
:gotJreHome
rem Check if we have a usable JRE
if not exist "%JRE_HOME%\bin\java.exe" goto noJreHome
goto okJava
:noJreHome
rem Needed at least a JRE
echo The JRE_HOME environment variable is not defined correctly
echo This environment variable is needed to run this program
goto exit
:okJava
rem Don't override the endorsed dir if the user has set it previously
if not "%JAVA_ENDORSED_DIRS%" == "" goto gotEndorseddir
rem Java 9 no longer supports the java.endorsed.dirs
rem system property. Only try to use it if
rem CATALINA_HOME/endorsed exists.
if not exist "%CATALINA_HOME%\endorsed" goto gotEndorseddir
set "JAVA_ENDORSED_DIRS=%CATALINA_HOME%\endorsed"
:gotEndorseddir
rem Don't override _RUNJAVA if the user has set it previously
if not "%_RUNJAVA%" == "" goto gotRunJava
rem Set standard command for invoking Java.
rem Also note the quoting as JRE_HOME may contain spaces.
set _RUNJAVA="%JRE_HOME%\bin\java.exe"
:gotRunJava
rem Don't override _RUNJDB if the user has set it previously
rem Also note the quoting as JAVA_HOME may contain spaces.
if not "%_RUNJDB%" == "" goto gotRunJdb
set _RUNJDB="%JAVA_HOME%\bin\jdb.exe"
:gotRunJdb
goto end
:exit
exit /b 1
:end
exit /b 0