如何检测是否在osgi容器中运行

Question

I have an OSGi bundle that can also run in plain Java process. I need to be able to tell if the bundle was loaded in an OSGi system or not. How can I do that? If there is no OSGi-standard way of doing this, I will settle for Eclipse/Equinox-specific approach.

Answer 1

Add Bundle-Activator to your MANIFEST.MF. If it gets instantiated, then your JAR is running in an OSGi container.

Answer 2

If you don't have an activator, you can also try asking for your bundle:

Bundle b = org.osgi.framework.FrameworkUtil.getBundle(MyClass.this);

If it returns null, your class wasn't loaded by OSGi.

Answer 3

You can check whether "this.getClass().getClassLoader() instanceof org.osgi.framework.BundleReference", which should only be true if you are running in an R4.2 OSGi framework.

Answer 4

An improved answer to Richard S. Hall that doesn't require a compile and runtime dependency to osgi. It also checks if the classloader of a class implements org.osgi.framework.BundleReference interface.

Class<?> classToCheck = this.getClass().getClassLoader().getClass();
boolean runningOsgi = isOsgiClassLoader(classToCheck);
...

boolean isOsgiClassLoader(Class<?> classLoaderClass) {
    Class<?> c = classLoaderClass;
    while (c != null) {
        if (c.getName().equals("org.osgi.framework.BundleReference")) {
            return true;
        }
        for (Class<?> ifc : c.getInterfaces()) {
            if (isOsgiClassLoader(ifc)) {
                return true;
            }
        }
        c = c.getSuperclass();
    }
    return false;
}