I have a new MacBook Air with the M1-CPU. I have installed eclipse and I can code with the IDE, but I can’t open a .jar-File because it is grayed out. My target is, to open the file with eclipse, so that i can edit the file.
Eclipse-specifications:
Version: 2020-12 (4.18.0) | Build id: 20201210-1552
When I would try to open the .jar file without a IDE it comes a Error with the massage:
“CleanCode.jar” cannot be opened because it comes from an unverified developer.
Then I opened it with control:
macOS cannot verify the developer of “CleanCode.jar”. Do you really want to open the app?
I accepted and then comes this Error:
Failed to launch the Java app.
In the Console I run this command:
java -jar Downloads/CleanCode.jar
And the Output was this:
Error: Invalid or corrupt jarfile Downloads/CleanCode.jar
My Settings:
java –version
Output: java 16 2021-03-16
I have installed Java SE Development Kit 16 for Mac and this Java Version 8 Update 281
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Answer
I have solved the problem. I do not have to click on “open”, I have to click on Import. After I need to check the “Existing Project into Workspace” under “General”. Then I can select the Jar-File as a Archive file and can open it.