doc: remove $JAVA_HOME section
This variable is no longer required
by Cooja.
@@ -66,21 +66,11 @@ To get the NRF52dk platform to work you will need to add SDK and programming too
```bash
$ sudo apt install default-jdk ant
-```
-
-Cooja needs to have the environment variable `JAVA_HOME` set to work with native Contiki nodes.
-
-```bash
$ update-alternatives --config java
There is only one alternative in link group java (providing /usr/bin/java): /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java
Nothing to configure.
```
-Set `JAVA_HOME` with the path found above in `.profile`:
-```bash
-$ echo 'export JAVA_HOME="/usr/lib/jvm/default-java"' >> ~/.profile
-```
-
### Install JTAG software for CC2538 (optional)
Many platforms such as Zolertia Zoul can be programmed via builtin USB but for programming a device using a JTAG dongle, Segger J-Link has been verified to work well with CC2538. The software for Segger J-Link can be downloaded from [Segger](https://www.segger.com/jlink-software.html). Download the installation file for Debian Linux.
