update-alternatives: warning: /etc/alternatives/java is dangling

Question

I am facing the problem while running the java program from command line. I have openjdk-6-jdk installed in my linux system and still shows the error relates with the openjdk-7-jdk. Initially i have jdk 7 installed in my system but ater i have removes it but still facing problem while running the application. after running the cammand ``` sudo update-alternatives --config java ``` it shows warning as follows update-alternatives: `warning: /etc/alternatives/java is dangling,` it will be updated with best choice. There is only one alternative in link group java: `/usr/lib/jvm/java-7-openjdk/jre/bin/java` Nothing to configure. what should I do?

Accepted Answer

Assuming you installed the OpenJDK6 with:

```
sudo apt-get install openjdk-6-jdk
```

In Ubuntu 64 bit, make sure the paths are valid for your installation (change if using 32bit version):

```
/usr/lib/jvm/java-6-openjdk-amd64/jre/bin/java

/usr/lib/jvm/java-6-openjdk-amd64/bin/javac
```

Setup update-alternatives:

```
sudo update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/java-6-openjdk-amd64/jre/bin/java" 1
sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/lib/jvm/java-6-openjdk-amd64/bin/javac" 1

sudo update-alternatives --set java /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/java
sudo update-alternatives --set javac /usr/lib/jvm/java-6-openjdk-amd64/bin/javac
```

Alternatively, make sure the correct version is checked for both Java and compiler:

```
sudo update-alternatives --config java
sudo update-alternatives --config javac
```

List the installed Java alternatives with:

```
sudo update-alternatives --list java
sudo update-alternatives --list javac
```

update-alternatives: warning: /etc/alternatives/java is dangling

Solution

Problem