IntelliJ can't run gradle project due to missing Class

Question

I just gave IntelliJ a try, because Eclipse annoyed me again. I imported my gradle project(jetty, vaadin) and it went quite smoothly. But when I tried to run it I encountered the following error message during "make":

Error:gradle-resources-test:vaadinsharedwidgets: java.lang.NoClassDefFoundError: org/apache/tools/ant/util/ReaderInputStream

"vaadinsharedwidgets" is a module of the project. From what I understand from the error, IntelliJ doesn't find ant, but this is intended because I don't use ant. It also not part of the transitive dependencies. The same project runs in eclipse fine and also building it in gradle works without any problems.

Update: I just checked in Eclipse and somehow the ant.jar is on the classpath in Eclipse but I can't link it to any project. I wonder how it got there.

Update2: Missing version information:

• IntelliJ: v14.0.1 CE (no plugins)
• Gradle: 2.2 (used via wrapper)
• Java 8 (1.8.0 b05)
• Vaadin 7.3.4

---

build.gradle:

apply from: 'http://nexus/gradle/vaadin.gradle'
apply from: 'http://nexus/gradle/java8.gradle'

version = '1.1'

description = "Gemeinsame Vaadin-Widgets"

vaadin.widgetset  'net.xyz.vaadinsharedwidgets.VaadinsharedWidgetsWidgetset'

dependencies {
    compile project(':ibhtheme')
    compile 'com.vaadin:vaadin-server:' + vaadin.version
    compile 'com.vaadin:vaadin-client:' + vaadin.version
}

jar{
    // Include source in jar
    from sourceSets.main.allJava
}

sourceSets.main.resources.srcDir  'src/main/webapp'

---

vaadin.gradle:

apply from: 'http://plugins.jasoft.fi/vaadin.plugin?version=0.9.2'

configurations {
    def conf = 'vaadin-client'
    def sources = project.sourceSets.main
    def testSources = project.sourceSets.test

    if (!project.configurations.hasProperty(conf)) {
        project.configurations.create(conf)

        sources.compileClasspath += project.configurations[conf]
        testSources.compileClasspath += project.configurations[conf]
        testSources.runtimeClasspath += project.configurations[conf]

        project.configurations[conf].exclude group: 'org.eclipse.jetty' 
    }
}


vaadin {
    version '7.3.4'
    push true
}

---

java8.gradle:

apply plugin: 'java'

sourceCompatibility = 1.8
targetCompatibility = 1.8

group = 'net.xyz'

dependencies {
    compile 'org.slf4j:slf4j-api:1.7.5'
    compile 'com.google.guava:guava:16.0.1'
    compile 'org.springframework:spring-context:4.0.3.RELEASE'

    testCompile 'org.testng:testng:6.8.7'
    testCompile 'org.mockito:mockito-all:1.9.5'
    testCompile 'org.easytesting:fest-assert-core:2.0M10'
    testCompile 'org.springframework:spring-test:4.0.3.RELEASE'
}

Adding ant as an additional dependency to the module doesn't work.

Answer 1

I encountered the same error in a Java project with multiple subprojects in IntelliJ 14.

Updating to 15.0.1, refreshing the Gradle projects via Views → Tool Windows → Gradle in IntelliJ and restarting fixed the issue.

Answer 2

Choose File → Invalidate Caches / Restart from the menu and select Invalidate and Restart. That fixed the issue for me.