"The filename or extension is too long error" using gradle

Just add this plugin ManifestClasspath in your build.gradle file and specify the manifest classpath.ManifestClasspath plugin creates a manifest jar for jar files in the classpath of JavaExec task and sets the classpath with the manifest jar.

plugins {    id 'org.springframework.boot' version '2.1.4.RELEASE'    id 'java'    id "com.github.ManifestClasspath" version "0.1.0-RELEASE"       }apply plugin: 'io.spring.dependency-management'apply plugin: 'application'mainClassName = 'com.example.demo.Application'dependencies { }

I had similar problem, in my situation this works fine:

 task pathingJar(type: Jar) {      dependsOn configurations.runtime      appendix = 'pathing'      doFirst {         manifest {             attributes "Class-Path": configurations.runtime.files.collect {it.toURL().toString().replaceFirst("file:/", '/')}.join(" ")         }     } } bootRun {     dependsOn pathingJar     doFirst {         classpath = files("$buildDir/classes/main", "$buildDir/resources/main", pathingJar.archivePath)     } }

If you use JetBrains Intellij Idea, you could solve it with one simple setting. Go to Run/Debug configuration and set Shorten command line to "JAR manifest". You should set it for each configuration you run, though.