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Using Fiddler with MSAL Java

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You can use the MSAL4J with a proxy such as Fiddler to debug requests and responses.

1. Set up a keystore file

  • From Fiddler, export FiddlerRoot.cer to desktop via Tools -> Options -> HTTPS -> Actions button
  • Open Command Prompt as an admin
  • Run JDK's keytool to create a keystore

<JDK_HOME>\bin\keytool.exe -import -file C:\Users\<username>\Desktop\FiddlerRoot.cer^ -keystore FiddlerKeystore -alias Fiddler

  • Enter a password for your keystore. Make sure to remember this as you will need it later on.

2a. Set up IntelliJ

  • In IntelliJ, open Run/Debug configurations
  • Create a new debug configuration called “Fiddler Trace”
  • Add the following VM Options:

-DproxySet=true -DproxyHost=127.0.0.1 -DproxyPort=8888 -Djavax.net.ssl.trustStorePassword="yourpassword" -Djavax.net.ssl.trustStore="path\to\keystore\FiddlerKeystore"

2b. Set up Eclipse

  • In Eclipse, open Run -> Run Configurations
  • Select the Run Configuration you want to use
  • Select the Arguments tab
  • Add the following arguments:

-DproxySet=true -DproxyHost=127.0.0.1 -DproxyPort=8888 -Djavax.net.ssl.trustStore="path\to\keystore\FiddlerKeystore" -Djavax.net.ssl.trustStorePassword="yourpassword"