Issue

When using 'String' as an entity name, Studio Pro throws the below Java compilation error:

C:\Users\<UserName>\Documents\Mendix\<Project name>\javasource\myfirstmodule\proxies\classname.java:29: error: cannot find symbol
[javac]throw new java.lang.IllegalArgumentException(String.format("The given object is not a %s", entityName));
[javac] ^
[javac]symbol: method format(java.lang.String,java.lang.String)
[javac]location: class myfirstmodule.proxies.String

Environment

Studio Pro version 8.1.0 to 9.14.2

Cause

This issue is caused when an entity is named 'String' inside the Domain model, as it is a reserved word. In Mendix, a reserved word is a term or identifier that has a special, predefined meaning within the Mendix platform and cannot be used as a custom identifier in your applications. These words are “reserved” for specific purposes in the Mendix language and development environment.

Solution/Workaround

• Rename the entity 'String' to a different name, and run the project to fix this issue.
• Alternatively, upgrade the project to Studio Pro 9.15.0 or a newer version to fix the issue.

Additional information 

Below is a list of words that either throw a warning beforehand, throw an error when trying to run, or do not throw an error at all while used in Studio Pro version 8.1.0 to 9.14.2.