Generation of a visibility bridge method.

bridge.sh

mkdir pkg1
echo "package pkg1; class SuperClass<X> { public X m() { return null; } }" > pkg1/SuperClass.java
echo "package pkg1; public class SubClass extends SuperClass<Void> { }" > pkg1/SubClass.java
${JAVA_HOME}/bin/javac pkg1/*.java
mkdir pkg2
echo "package pkg2; class Main { public static void main(String[] args) throws Exception { pkg1.SubClass.class.getMethod(\"m\").invoke(new pkg1.SubClass()); } }" > pkg2/Main.java
${JAVA_HOME}/bin/javac pkg2/*.java
${JAVA_HOME}/bin/java -cp . pkg2.Main