Javaws application fails to start using -javaagent option by throwing following exception
InvalidArgumentException[ Invalid arguments supplied: { }]
at com.sun.javaws.Main.continueInSecureThread(Unknown Source)
at com.sun.javaws.Main$1.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

We need this option to work correctly in order to generate codecoverage data succesfully against jdk8

Steps to reprduce:
1) INstall jdk 8 build
2) Get the attached jcov.jar and set JAVAWS_VM_ARGS to following option

-javaagent:<jcov_jar_location>/jcov.jar=type=all,file=<jcov_data_location>/batJavaws__testBAT.jcov.xml,i=javax.jnlp.*,i=com.sun.javaws.*,i=com.sun.javaws.exceptions.*,i=com.sun.javaws.jnl.*,i=com.sun.javaws.net.*,i=com.sun.javaws.security.*,i=com.sun.jnlp.*,i=com.sun.deploy.cache.*,i=com.sun.deploy.config.*,i=com.sun.deploy.jardiff.*,i=com.sun.deploy.net.*,i=com.sun.deploy.security.*,i=com.sun.deploy.services.*,i=com.sun.deploy.util.*,i=com.sun.deploy.si.*,i=com.sun.deploy.ui.*,i=com.sun.deploy.xml.*,i=com.sun.javaws.*,i=com.sun.deploy.association.*,i=com.sun.deploy.association.utility.*,i=sun.plugin2.*,i=java.applet.*

Note: Make sure to set <jcov_jar_location> and <jcov_data_location> inside the options given above as per your settings
3) export JAVAWS_VM_ARGS to you env and try to launch any javaws application
If it fails to launch then bug is reprodcued
 

Same behavior can be seen with -J and _JAVA_OPTIONS too
Also, Fred tested it on 64bit win7, ie8, jre8 nightly build 414, also can't reproduce this bug.