The gradle build tries to find the version of the used Java JDK by
running 'java -version', skipping the first line and expects to find the
version in the second line.
However, on Linux (Ubuntu) the first line of *any* Java invocation is
"Picked up JAVA_TOOL_OPTIONS:
-javaagent:/usr/share/java/jayatanaag.jar"[1], thus failing at detection
of the version, aborting the build.
The 'Pickup up...' line is a standard feature of the JDK and a legacy
that doesn't seem to be removed soon[2].
I guess the build script needs to accommodate for this.
Proposed fix:
// Determine the verion of Java in JDK_HOME. It looks like this:
//
// $ java -version
// Picked up JAVA_TOOL_OPTIONS:
-javaagent:/usr/share/java/jayatanaag.jar
// java version "1.7.0_45"
// Java(TM) SE Runtime Environment (build 1.7.0_45-b18)
// Java HotSpot(TM) 64-Bit Server VM (build 24.45-b08, mixed mode)
//
// The first line is optional, we need to parse the third line
def inStream = new java.io.BufferedReader(new
java.io.InputStreamReader(new java.lang.ProcessBuilder(JAVA,
"-version").start().getErrorStream()));
try {
String v = inStream.readLine();
if (v != null) {
if (v.startsWith("Picked up")) {
inStream.readLine();
}
v = inStream.readLine();
[1] https://community.oracle.com/thread/1239778?start=0&tstart=0
[2] https://bugs.openjdk.java.net/browse/JDK-8039152
