gradle - including compiled classes to testCompile to avoid NoClassDefFoundError - gradle

Question

I am trying to include compiled classes (from the project3) to run junit tests.
Here is a brief project structure.
project1
build.gradle
project2
build.gradle
project3
src/main/java/***.java
src/test/java/***JunitTestClasses
build.gradle - I am running this.
Here is the build.gradle from project3.
apply plugin: 'java'
apply plugin: "jacoco"
apply plugin: 'maven'
apply plugin: 'com.github.jacobono.jaxb'
apply plugin: "io.spring.dependency-management"
sourceCompatibility = 1.8
targetCompatibility = 1.8
buildscript {
repositories {
maven
{
// omitted.
}
}
dependencies
{
classpath 'com.github.jacobono:gradle-jaxb-plugin:' + GRADLE_JAXB_PLUGIN_VERSION
classpath 'io.spring.gradle:dependency-management-plugin:' + GRADLE_DEP_MGMT_PLUGIN_VERSION
}
}
dependencies
{
compile project(':project1')
compile project(':project2')
compile project(':project3')
compile group: 'org.apache.ant', name: 'ant', version: ANT_VERSION
jaxb group: 'com.sun.xml.bind', name: 'jaxb-xjc', version: JAXB_VERSION
jaxb group: 'com.sun.xml.bind', name: 'jaxb-impl', version: JAXB_VERSION
jaxb group: 'com.sun.xml.bind', name: 'jaxb-core', version: JAXB_VERSION
xmlbeans 'org.apache.xmlbeans:xmlbeans:2.5.0'
testCompile group: 'junit', name: 'junit', version: '4.+'
runtime files('build/classes/main')
}
configurations {
repobootstrap
xmlbeans
}
sourceSets {
generated {
java {
srcDir file("${buildDir}/generated")
}
}
testGenerated {
compileClasspath += sourceSets.main.runtimeClasspath
java {
srcDir file("${buildDir}/generated")
}
}
main {
compileClasspath += sourceSets.generated.output
runtimeClasspath += sourceSets.generated.output
}
test {
compileClasspath += sourceSets.generated.output
runtimeClasspath += sourceSets.generated.output
}
}
test
{
systemProperties 'basedir': projectDir
systemProperties 'testdir': "${projectDir}/src/test"
systemProperties 'resourcedir': "${projectDir}/src/test/resources"
systemProperties 'TARGET': "${buildDir}/tmp"
systemProperties 'tmp.dir': "${buildDir}/tmp"
}
Some tasks which generate classes from XSD are omitted..
When I do 'gradle build', it successfully generates classes from XML and compiles. But when junit tests run, it throws 'java.lang.NoClassDefFoundError' for classes that belong to project3 and 'java.lang.ClassNotFoundException: schemaorg_apache_xmlbeans.system.sE2A73A83DA959459556520519D4CA82A.TypeSystemHolder'. Generated artifacts for xmlbeans are located under generated\schemaorg_apache_xmlbeans3 and compiled classes are located under project3/build/main
I'd appreciated if somebody has any clue.