AssertionError when running SpaceShips-demo about quasar HOT 4 CLOSED

This is probably an easy fix, but I wonder what makes it happen in your setup.

The thing that immediately jumps out at me is that you're running Java in client mode ("Client VM") rather than Server VM. A quick search has shown that on windows, the JRE only supports the client mode. If this is the cause and you'd like to give it a try, please download the JDK.

In any case, we'll fix that (requires different array base offset values for long arrays)

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I've got both the JDK and the JVM installed (and even a 64-bit JVM), so the tricky thing is to get Gradle to use the correct JVM. Any hints as to how? (I'm a Gradle novice).

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Can you set the JAVA_HOME environment variable to point to the JDK directory? I think that should do it. Alternatively, put the JDK's bin directory on your path rather than the JRE's.

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This bit worked:

tasks.withType(JavaExec) {
    executable 'c:/Program Files/Java/jre7/bin/java'
    jvmArgs '-d64'
    jvmArgs '-server'
    jvmArgs '-showversion'

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