NoClassDefFoundError

When using the Gurobi Java API, you may see a java.lang.NoClassDefFoundError exception such as:

java.lang.NoClassDefFoundError: gurobi/GRBException
java.lang.NoClassDefFoundError: Could not initialize class gurobi.GurobiJni

This error indicates that the Gurobi Java library (gurobi.jar) was not found within your Java classpath at the time of execution. This file is located in the lib subdirectory of the Gurobi installation.

To set the classpath for Java on Linux, you can use either:

• set the CLASSPATH environment variable or
• us the command-line option -cp or -classpath for the Java Runtime Environment.

Further information

• How do I use Gurobi in an Eclipse Java project?