classgraph: Unable to resolve UNC-based classpath entries

Hello Luke!

I have come across a problem where UNC-based classpath entries are not resolved correctly. I think I’ve boiled it down to this test scenario:

public class Main {
    public static void main(String[] args) throws Exception {
        String packagesToScan = args[0];
        String interfaceClass = args[1];

        ScanResult scanResult = new ClassGraph().acceptPackages(packagesToScan)
                .ignoreParentClassLoaders()
                .overrideClasspath("\\\\192.168.216.1\\workspace\\gemfire\\geode-assembly\\build\\install\\apache-geode\\lib\\spring-shell-1.2.0.RELEASE.jar")
                .enableClassInfo()
                .enableRealtimeLogging()
                .scan(1);

        ClassInfoList classInfoList = scanResult.getClassesImplementing(interfaceClass);

        classInfoList.forEach(x -> System.out.println(x.getName()));
    }
}

When run with these args:

org.springframework.shell org.springframework.shell org.springframework.shell.core.Converter

Produces this log:

Sep 26, 2022 2:09:52 PM nonapi.io.github.classgraph.utils.LogNode flush
INFO: 2022-09-26T14:09:52.636-0700	ClassGraph	ClassGraph version 4.8.149
2022-09-26T14:09:52.637-0700	ClassGraph	Operating system: Windows 10 10.0 amd64
2022-09-26T14:09:52.637-0700	ClassGraph	Java version: 1.8.0_345 / 1.8.0_345-b01 (BellSoft)
2022-09-26T14:09:52.638-0700	ClassGraph	Java home: C:\Users\IEUser\.jdks\liberica-1.8.0_345\jre
2022-09-26T14:09:52.648-0700	ClassGraph	JRE rt.jar:
2022-09-26T14:09:52.648-0700	ClassGraph	-- C:/Users/IEUser/.jdks/liberica-1.8.0_345/jre/lib/rt.jar
2022-09-26T14:09:52.658-0700	ClassGraph	ScanSpec:
2022-09-26T14:09:52.658-0700	ClassGraph	-- packageAcceptReject: accept: ["org.springframework.shell"]; acceptPrefixes: ["", "/", "org.", "org.springframework.", "org.springframework.shell."]
2022-09-26T14:09:52.658-0700	ClassGraph	-- packagePrefixAcceptReject: acceptPrefixes: ["org.springframework.shell."]
2022-09-26T14:09:52.658-0700	ClassGraph	-- pathAcceptReject: accept: ["org/springframework/shell/"]; acceptPrefixes: ["", "/", "org/", "org/springframework/", "org/springframework/shell/"]
2022-09-26T14:09:52.658-0700	ClassGraph	-- pathPrefixAcceptReject: acceptPrefixes: ["org/springframework/shell/"]
2022-09-26T14:09:52.658-0700	ClassGraph	-- classAcceptReject: 
2022-09-26T14:09:52.658-0700	ClassGraph	-- classfilePathAcceptReject: 
2022-09-26T14:09:52.659-0700	ClassGraph	-- classPackageAcceptReject: 
2022-09-26T14:09:52.659-0700	ClassGraph	-- classPackagePathAcceptReject: 
2022-09-26T14:09:52.659-0700	ClassGraph	-- moduleAcceptReject: 
2022-09-26T14:09:52.659-0700	ClassGraph	-- jarAcceptReject: 
2022-09-26T14:09:52.659-0700	ClassGraph	-- classpathElementResourcePathAcceptReject: 
2022-09-26T14:09:52.659-0700	ClassGraph	-- libOrExtJarAcceptReject: 
2022-09-26T14:09:52.660-0700	ClassGraph	-- scanJars: true
2022-09-26T14:09:52.660-0700	ClassGraph	-- scanNestedJars: true
2022-09-26T14:09:52.660-0700	ClassGraph	-- scanDirs: true
2022-09-26T14:09:52.660-0700	ClassGraph	-- scanModules: true
2022-09-26T14:09:52.660-0700	ClassGraph	-- enableClassInfo: true
2022-09-26T14:09:52.660-0700	ClassGraph	-- enableFieldInfo: false
2022-09-26T14:09:52.660-0700	ClassGraph	-- enableMethodInfo: false
2022-09-26T14:09:52.660-0700	ClassGraph	-- enableAnnotationInfo: false
2022-09-26T14:09:52.660-0700	ClassGraph	-- enableStaticFinalFieldConstantInitializerValues: false
2022-09-26T14:09:52.660-0700	ClassGraph	-- enableInterClassDependencies: false
2022-09-26T14:09:52.661-0700	ClassGraph	-- enableExternalClasses: false
2022-09-26T14:09:52.661-0700	ClassGraph	-- enableSystemJarsAndModules: false
2022-09-26T14:09:52.661-0700	ClassGraph	-- ignoreClassVisibility: false
2022-09-26T14:09:52.661-0700	ClassGraph	-- ignoreFieldVisibility: false
2022-09-26T14:09:52.661-0700	ClassGraph	-- ignoreMethodVisibility: false
2022-09-26T14:09:52.661-0700	ClassGraph	-- disableRuntimeInvisibleAnnotations: false
2022-09-26T14:09:52.661-0700	ClassGraph	-- extendScanningUpwardsToExternalClasses: true
2022-09-26T14:09:52.661-0700	ClassGraph	-- allowedURLSchemes: null
2022-09-26T14:09:52.661-0700	ClassGraph	-- addedClassLoaders: null
2022-09-26T14:09:52.661-0700	ClassGraph	-- overrideClassLoaders: null
2022-09-26T14:09:52.661-0700	ClassGraph	-- addedModuleLayers: null
2022-09-26T14:09:52.661-0700	ClassGraph	-- overrideModuleLayers: null
2022-09-26T14:09:52.661-0700	ClassGraph	-- overrideClasspath: [\\192.168.216.1\workspace\gemfire\geode-assembly\build\install\apache-geode\lib\spring-shell-1.2.0.RELEASE.jar]
2022-09-26T14:09:52.661-0700	ClassGraph	-- classpathElementFilters: null
2022-09-26T14:09:52.661-0700	ClassGraph	-- initializeLoadedClasses: false
2022-09-26T14:09:52.662-0700	ClassGraph	-- removeTemporaryFilesAfterScan: false
2022-09-26T14:09:52.662-0700	ClassGraph	-- ignoreParentClassLoaders: true
2022-09-26T14:09:52.662-0700	ClassGraph	-- ignoreParentModuleLayers: false
2022-09-26T14:09:52.662-0700	ClassGraph	-- modulePathInfo: 
2022-09-26T14:09:52.662-0700	ClassGraph	-- maxBufferedJarRAMSize: 67108864
2022-09-26T14:09:52.662-0700	ClassGraph	-- enableMemoryMapping: false
2022-09-26T14:09:52.662-0700	ClassGraph	Number of worker threads: 1
2022-09-26T14:09:52.671-0700	ClassGraph	Finding classpath
2022-09-26T14:09:52.672-0700	ClassGraph	-- Finding classpath and modules
2022-09-26T14:09:52.693-0700	ClassGraph	---- Overriding classpath with: [\\192.168.216.1\workspace\gemfire\geode-assembly\build\install\apache-geode\lib\spring-shell-1.2.0.RELEASE.jar]
2022-09-26T14:09:52.697-0700	ClassGraph	------ Found classpath element: //192.168.216.1/workspace/gemfire/geode-assembly/build/install/apache-geode/lib/spring-shell-1.2.0.RELEASE.jar
2022-09-26T14:09:52.697-0700	ClassGraph	------ WARNING: when the classpath is overridden, there is no guarantee that the classes found by classpath scanning will be the same as the classes loaded by the context classloader
2022-09-26T14:09:52.700-0700	ClassGraph	Opening classpath elements (took 0.107643 sec)
2022-09-26T14:09:52.804-0700	ClassGraph	-- Opening classpath element file://192.168.216.1/workspace/gemfire/geode-assembly/build/install/apache-geode/lib/spring-shell-1.2.0.RELEASE.jar
2022-09-26T14:09:52.805-0700	ClassGraph	---- Opening jar: file://192.168.216.1/workspace/gemfire/geode-assembly/build/install/apache-geode/lib/spring-shell-1.2.0.RELEASE.jar
2022-09-26T14:09:52.807-0700	ClassGraph	------ Could not open jarfile file://192.168.216.1/workspace/gemfire/geode-assembly/build/install/apache-geode/lib/spring-shell-1.2.0.RELEASE.jar : java.io.IOException: Could not get logical zipfile file://192.168.216.1/workspace/gemfire/geode-assembly/build/install/apache-geode/lib/spring-shell-1.2.0.RELEASE.jar : java.io.IOException: Could not get PhysicalZipFile for path /192.168.216.1/workspace/gemfire/geode-assembly/build/install/apache-geode/lib/spring-shell-1.2.0.RELEASE.jar : java.io.FileNotFoundException: File does not exist or cannot be read: C:\192.168.216.1\workspace\gemfire\geode-assembly\build\install\apache-geode\lib\spring-shell-1.2.0.RELEASE.jar
2022-09-26T14:09:52.807-0700	ClassGraph	Finding nested classpath elements
2022-09-26T14:09:52.807-0700	ClassGraph	Final classpath element order:
2022-09-26T14:09:52.808-0700	ClassGraph	Scanning classpath elements (took 0.000397 sec)
2022-09-26T14:09:52.808-0700	ClassGraph	Masking classfiles (took 0.000017 sec)
2022-09-26T14:09:52.810-0700	ClassGraph	Scanning classfiles (took 0.000014 sec)
2022-09-26T14:09:52.810-0700	ClassGraph	Linking related classfiles (took 0.000020 sec)
2022-09-26T14:09:52.814-0700	ClassGraph	Total time: 0.113 sec

As you’re probably aware, Java can open UNC-based files. If one passes something like file://192.168.216.1/workspace/somefile to this snippet:

        URI uri = new URI(args[0]);
        Path path = Paths.get(uri);

The path ends up pointing to a WindowsPath object (that looks like \\192.168.216.1\workspace\somefile) and is able to be opened and read.

Thanks for your time!