Q:

How to configure "Shorten command line" method for whole project in IntelliJ

When I run tests I get the error "Command line is too long".
 It works if I set the "Shorten command line" method in the Run/Debug configuration to "JAR manifest" for the specific method or class, but how do I set it for the whole project or is there an IDE global setting for it? 

A:

Inside your  .idea folder, change workspace.xml file
Add 
<property name="dynamic.classpath" value="true" />

to 
  <component name="PropertiesComponent">
.
.
.
  </component>

Example
 <component name="PropertiesComponent">
    <property name="project.structure.last.edited" value="Project" />
    <property name="project.structure.proportion" value="0.0" />
    <property name="project.structure.side.proportion" value="0.0" />
    <property name="settings.editor.selected.configurable" value="preferences.pluginManager" />
    <property name="dynamic.classpath" value="true" />
  </component>

If you don't see one, feel free to add it yourself
 <component name="PropertiesComponent">
    <property name="dynamic.classpath" value="true" />
  </component>

A:

Intellij 2018.2.5
Run => Edit Configurations => Choose Node on the left hand side => expand Environment => Shorten Command line options => choose Classpath file or JAR manifest

A:

You can set up a default way to shorten the command line and use it as a template for further configurations by changing the default JUnit Run/Debug Configuration template. Then all new Run/Debug configuration you create in project will use the same option.
Here is the related blog post about configurable command line shortener option.

