Have tried variations of this (forward slash, back slash, double back slash) but NetBeans keep saying syntax error when I run the project

-Djava.library.path="C:\Program Files\IBM\ILOG\CPLEX_Studio2211\cplex\bin\x64_win64"  (This is under project , properties , run VM options)

Netbeans says: The syntax of the command is incorrect.

 "JAVA_HOME=C:\\Program Files\\Amazon Corretto\\jdk21.0.8_9" cmd /c "\"C:\\Program Files\\NetBeans-23\\netbeans\\java\\maven\\bin\\mvn.cmd\" \"-Dexec.vmArgs='-Djava.library.path=\"C:\\Program Files\\IBM\\ILOG\\CPLEX_Studio2211\\cplex\\bin\\x64_win64\"'\" \"-Dexec.args=${exec.vmArgs} -classpath %classpath ${exec.mainClass} ${exec.appArgs}\" -Dexec.appArgs= -Dexec.mainClass=com.mycompany.saipops_v12_gold.SaiPOPS_v12_gold_Driver \"-Dexec.executable=C:\\Program Files\\Amazon Corretto\\jdk21.0.8_9\\bin\\java.exe\" \"-Dmaven.ext.class.path=C:\\Program Files\\NetBeans-23\\netbeans\\java\\maven-nblib\\netbeans-eventspy.jar\" --no-transfer-progress process-classes org.codehaus.mojo:exec-maven-plugin:3.1.0:exec"

EDIT: PROBLEM SEEMS TO HAVE GONE AWAY AFTER REBOOT.

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Srini tamvada
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VM Options (what you had is fine)

In Project Properties → Run → VM Options, use exactly:

-Djava.library.path=C:\Program Files\IBM\ILOG\CPLEX_Studio2211\cplex\bin\x64_win64

• No quotes
• No escaping
• No slashes changed

Java handles spaces correctly at this level.

Even better (recommended for CPLEX)

Option 2: Use PATH instead of java.library.path

CPLEX officially recommends this.

Add to Windows Environment Variables:

PATH += C:\Program Files\IBM\ILOG\CPLEX_Studio2211\cplex\bin\x64_win64

Then remove -Djava.library.path entirely.

This avoids all NetBeans/Maven quoting problems.

How to verify it is really fixed

Add this once in main():

System.out.println(System.getProperty("java.library.path"));

You should see:

...;C:\Program Files\IBM\ILOG\CPLEX_Studio2211\cplex\bin\x64_win64;...

If CPLEX loads without UnsatisfiedLinkError, You're done.