Requirements

Java environment

Since NoiseModelling is developped with the Java langage, you will need to install the Java Runtime Environment (JRE) on your computer to use the application.

NoiseModelling requires Java >= 11. Any version of Java 11 or later is supported.

Windows

If you are launching NoiseModelling thanks to the NoiseModelling_xxx_install.exe file, the JRE is already inside, so you don’t have anything to do.

If you are not using the .exe file, you have to launch NoiseModelling thanks to the `start_windows.bat file (in the NoiseModelling_xxx.zip release file). In this case, Java >= 11 has to be installed before.

Download and install Java: choose between OpenJDK or Oracle versions.
You can check if JAVA_HOME environment variable is well settled to your last installed Java folder using echo %JAVA_HOME% in your command prompt. You should have a result similar to C:\Program Files\Java\jdk-17.0.4.1\.
If you don’t have this result, it is probably because your JAVA_HOME environment variable is not well settled. To set you JAVA_HOME environment variable you can adapt (with x the JAVA version number) you installed and use the following command line : setx JAVA_HOME "C:\Program Files\Java\jdk-17.0.4.1\" in your command prompt. You can also refer to this document for example.
You may have to reboot your command prompt after using the precedent command line before printing again echo %JAVA_HOME%.

Warning

The command promprt should print C:\Program Files\Java\jdk-17.0.4.1\ without the bin directory. If JAVA_HOME is settled as C:\Program Files\Java\jdk-17.0.4.1\bin, it will not work.

Linux or Mac

If not already done, you have to install the Java version >= 11.

Check whether Java is already installed:
```
java -version
```
The command should print a version starting with 11. Otherwise, install Java first.
Download and install Java: choose between OpenJDK or Oracle versions.
Find the installation path to use for JAVA_HOME.

On Linux:
```
readlink -f "$(command -v java)"
```
This prints a path ending with /bin/java (for example /usr/lib/jvm/java-22-openjdk-amd64/bin/java); JAVA_HOME is the parent directory of bin (here /usr/lib/jvm/java-22-openjdk-amd64).

On macOS:
```
/usr/libexec/java_home -v latest
```
This prints the directory that must be used as JAVA_HOME for Java.

Set the JAVA_HOME environment variable and update your PATH (adapt the path with the one found above):

export JAVA_HOME=/usr/lib/jvm/java-22-openjdk-amd64
export PATH="$JAVA_HOME/bin:$PATH"

On macOS you can also use:

export JAVA_HOME=$(/usr/libexec/java_home -v latest)
export PATH="$JAVA_HOME/bin:$PATH"

Verify that JAVA_HOME is correctly set:
```
echo $JAVA_HOME
```
You should get the Java directory (for example /usr/lib/jvm/java-22-openjdk-amd64). If this is not the case, you are invited to follow the steps proposed here.