Maven 错误: 也许您运行的是 JRE 而不是 JDK？

我以前从来没有使用过 Maven，当我运行这个命令时，我遵循的是 给你。指令

mvn integration-test -Pamp-to-war

它最初下载了一大堆依赖项，最后它显示,

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

我在 Ubuntu 13.04上。

如果你有什么想让我告诉你的，请告诉我，谢谢。

剪辑

当我做 echo $JAVA_HOME我得到 /usr/lib/jvm/java-7-openjdk-i386/

当我做 mvn -version的时候

我明白,

Apache Maven 3.0.4
Maven home: /usr/share/maven
Java version: 1.7.0_25, vendor: Oracle Corporation
Java home: /usr/lib/jvm/java-7-openjdk-i386/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "3.8.0-26-generic", arch: "i386", family: "unix"

另外，我发现了 别人面临的这个问题。但是我不知道如何去解决这个问题？

进一步编辑。

kraken@kraken-Inspiron-1545:/usr/lib/jvm/java-7-openjdk-i386$ ls -l
total 12
drwxr-xr-x 2 root root 4096 Sep  9 10:44 bin
lrwxrwxrwx 1 root root   41 Jul  4  2013 docs -> ../../../share/doc/openjdk-7-jre-    headless
drwxr-xr-x 5 root root 4096 Oct 13  2013 jre
drwxr-xr-x 4 root root 4096 Oct 13  2013 man
257921 次浏览
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最佳答案

Apparently, it requires tools.jar file inside the lib folder of my $JAVA_HOME. I did not have the lib folder, so I reinstalled my jdk using command 

apt-get install openjdk-7-jdk openjdk-7-doc openjdk-7-jre-lib

Also, this link may help some people.

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This is how i fixed my problem

right clik on the project > properties > Java Compiler (select the one you are using)

it was 1.5 for me but i have 1.8 installed. so i changed it to 1.8.. and voilla it worked!.

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I've been facing the same issue with java 8 (ubuntu 16.04), trying to compile using mvn command line.

I verified my $JAVA_HOME, java -version and mvn -version. Everything seems to be okay pointing to /usr/lib/jvm/java-8-openjdk-amd64.

It appears that java-8-openjdk-amd64 is not completly installed by default and only contains the JRE (despite its name "jdk").

Re-installing the JDK did the trick.

sudo apt-get install openjdk-8-jdk

Then some new files and new folders are added to /usr/lib/jvm/java-8-openjdk-amd64 and mvn is able to compile again.

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For me, it worked like following. Please look at JAVA_HOME environment variable, whether it is pointing to JRE or JDK.? If it pointed to JRE, you will face "Perhaps you are running on a JRE rather than a JDK" issue. if so change the path to JDK.

Modifying like this, it worked for me.

JAVA_HOME C:\Program Files\Java\jdk1.8.0_31

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Right click on your project folder (Maven one), select properties and from the properties window, again select Java Compiler and see what is selected against compiler compliance level and make sure that it is the same version as your jre. In my case I had 1.8 but 1.5 was selected against compiler compliance level. After selecting 1.8 the build was successful without this error.

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Add this configurations in pom.xml

<project ...>
...
<build>
...
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
<fork>true</fork>
<executable>C:\Program Files\Java\jdk1.7.0_79\bin\javac</executable>
</configuration>
</plugin>
</plugins>
</build>
...
</project>
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Check if /usr/bin has 'javac'. If not you have installed JRE & have to install jdk dev version like "java-1.8.0-openjdk-devel.x86_64"

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I had the same error and I was missing the User variable: JAVA_HOME and the value for the SDK - "C:\Program Files\Java\jdk-9.0.1" in my case

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Just adding more details on where to setup. Main reason would be the JAVA_HOME setup in the environment variable should be pointing to correct JDK location.

  1. Check System -> Advance System Settings
  2. Click on Environment variable
  3. Add variable JAVA_HOME -> "C:\Program Files\Java\jdk1.8.0_141;"
  4. Edit "path" -> append %JAVA_HOME%; to the existing text.
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I had the same issue after installing the java-1.8.0-openjdk package on an AWS Linux AMI. The incorrect assumption I made, was that because the file ended in openjdk it would be the jdk version. This is not the case.

The openjdk install page explains everything clearly.

The java-1.8.0-openjdk package contains just the Java Runtime Environment. If you want to develop Java programs then install the java-1.8.0-openjdk-devel package.

If you've already installed the java-1.8.0-openjdk package, just leave it and the JAVA_HOME value if it's working for the JRE and install the java-1.8.0-openjdk-devel package using yum install java-1.8.0-openjdk-devel -y.

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I faced the issue even though JAVA_HOME was pointing to JDK. It took time to figure out why it was throwing the exception.

The issue was I set JAVA_HOME as admin user on my window machine. You need to add JAVA_HOME environment variable pointing to right JDK to your user profile environment variable settings.

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This is because of running jre rather than jdk, to install jdk follow below steps

Installing java 8 in amazon linux/redhat

--> yum search java | grep openjdk

--> yum install java-1.8.0-openjdk-headless.x86_64

--> yum install java-1.8.0-openjdk-devel.x86_64

--> update-alternatives --config java #pick java 1.8 and press 1

--> update-alternatives --config javac #pick java 1.8 and press 2

Thank You

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For solving my issue on Linux don't have a JDK, I just download the JDK and upload to the Linux server, and type: tar xvf jdk-8u45-linux-x64.tar.gz

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I was facing the same issue. I needed to place the JDK before the JRE in PATH in order to resolve.

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Problem statement = No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?

Solution

Please set the Environment variable like below to solve the issue

Variable name : JAVA_HOME

Variable Value : C:\Program Files\Java\jdk1.8.0_202

Variable name : M2_HOME

Variable Value : C:\Program Files\apache-maven-3.6.0

Moreover, Add Java and maven path in "System Variables" like below:

  1. C:\Program Files\Java\jdk1.8.0_202\bin
  2. C:\Program Files\apache-maven-3.6.0\bin
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i am using centos and getting same error when run mvn command with goal, install. After some googling i have found the solution to run following command.

sudo yum install java-1.8.0-openjdk-devel

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I was facing the same issue in eclipse maven project, all i did was
right click on the project
maven --> update project
or just press ALT+ F5

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If the above solutions doesn't work then try to place java path before maven in path of environment variable. It worked for me.

%JAVA_HOME%\bin

C:\Program Files\apache-maven-3.6.1-bin\apache-maven-3.6.1\bin

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Here's my automatic solution...

This will follow your javac executable's symlink (setup by yum and/or alternatives --config java) backwards to find the JAVA_HOME. (Toss this in your in your /etc/profile):

export JAVA_HOME=$(readlink -f /usr/bin/javac | sed 's:/bin/javac$::')

If you wanted a stable path (refreshed on boot) launch something like this:

export JAVA_HOME=$(readlink -f /usr/bin/javac | sed 's:/bin/javac$::')
ln -sfn "${JAVA_HOME}" /usr/lib/jvm/jdk-current

I'm kinda shocked the latter still isn't baked into alternatives.

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In Installed JREs path see if there is an entry pointing to your JDK path or not. If not, click on Edit button and put the path you configured your JAVA_HOME environment:

Eclipse Path: Window → Preferences → Java → Installed JREs
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I was getting below error in Maven project in Eclipse

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

I solved it by following the below solution

Solution: Eclipse->Project->Right click->Build Path->Configure Build Path->Add jdk path(Eg: C:\Program Files\Java\jdk1.8.0_45)

Note: Earlier Build path in eclipse project was pointing to jre path

And also add jdk path in Environment Variable in Advanced system settings

Variable Name: JAVA_HOME

Variable Value: C:\Program Files\Java\jdk1.8.0_45

And also make sure in eclipse below pointing is (jdk path-> C:\Program Files\Java\jdk1.8.0_45 )

Windows -> Preferneces -> Java -> Installed JRE's

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too many java virtual machines?

place check with command:

/usr/libexec/java_home -V
java -version
mvn -version

uninstall java click here

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I get this error when JAVA_HOME is not properly set.

I have tried this command

$ /usr/libexec/java_home -V

which gives 3 virtual machines

Matching Java Virtual Machines (3):
1.8.291.10 (x86_64) "Oracle Corporation" - "Java" /Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home
1.8.0_291 (x86_64) "Oracle Corporation" - "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_291.jdk/Contents/Home
1.8.0_181 (x86_64) "Oracle Corporation" - "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home

In such case, specific version is required.

This

$ /usr/libexec/java_home -v1.8
/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home

differs from

$ /usr/libexec/java_home -v1.8.0
/Library/Java/JavaVirtualMachines/jdk1.8.0_291.jdk/Contents/Home

Therefore solution is to set ~/.bash_profile with

export JAVA_HOME=`/usr/libexec/java_home -v 1.8.0`
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Solution for Mac users who recently updated to MacOS Monterey

If you've encountered this issue after updating your macOS to Monterey recently, try running this command:

sudo rm -fr /Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin

Afterwards, continue using maven like usual. Hope this helped :)


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