bytedeco/javacpp

java.net.MalformedURLException: Unknown protocol: jar

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#581 opened on Jun 16, 2022

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Description

I've encountered a problem accessing classes with newer versions of java:

Uncaught Exception: java.lang.UnsatisfiedLinkError: java.net.MalformedURLException: Unknown protocol: jar java.lang.UnsatisfiedLinkError: java.net.MalformedURLException: Unknown protocol: jar at org.bytedeco.javacpp.Loader.loadLibrary(Loader.java:1759) at org.bytedeco.javacpp.Loader.load(Loader.java:1345) at org.bytedeco.javacpp.Loader.load(Loader.java:1157) at org.bytedeco.javacpp.Loader.load(Loader.java:1133)

The interesting thing is that this only seems to happen with later versions of Java (15+). When I run the same code in Java11, i do not get this error?

Contributor guide

Research direction
Investigate how Java 15+ handles 'jar' protocol in URL class loading compared to Java 11, and identify potential workarounds or patches in the Loader class.
Tech stack
javacpp
Domain
backend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Needs investigation
Prerequisites
Java
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70