Problem loading a Java agent meant for Java versions higher than 52 (Java 8) into a JNLP applet launched with OpenWebStart

There's an issue with loading a Java agent meant for Java versions higher than 52 (Java 8) into a **JNLP** applet launched with **OpenWebStart**. Setting the ```-javaagent:``` option through the ```JAVA_TOOL_OPTIONS``` environment variable tries to load the agent, but the problem is that the Java 8 bootstrap JVM (**icedtea-web**) used by **OpenWebStart** also attempts to load the agent. This cause the following incompatibility error:

```
Picked up JAVA_TOOL_OPTIONS: "-javaagent:"
Exception in thread "main" java.lang.UnsupportedClassVersionError: has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:756)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:473)
at java.net.URLClassLoader.access$100(URLClassLoader.java:74)
at java.net.URLClassLoader$1.run(URLClassLoader.java:369)
at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
at sun.instrument.InstrumentationImpl.loadClassAndStartAgent(InstrumentationImpl.java:304)
at sun.instrument.InstrumentationImpl.loadClassAndCallPremain(InstrumentationImpl.java:401)
FATAL ERROR in native method: processing of -javaagent failed
```