VisualVM Throws Exceptions On Startup (Proxy vs. JavaScript)

[jisedlac]

Windows 10, VisualVM 2.1.7, fresh installation.

Starting the VisualVM on a network behind a corporate proxy, with a wpad.dat, an exception is reported immediately on startup:

Cannot find secure PAC script engine...

The problem is that a JavaScript engine is needed to process the wpad.dat file. But the engine is only available as a plugin which requires a network access.

The corresponding logfile messages are as follows:

INFO [org.netbeans.core.network.proxy.NetworkProxyReloader]: System network proxy resolver: Windows
INFO [org.netbeans.core.network.proxy.windows.WindowsNetworkProxy]: Windows system proxy resolver: auto - PAC (http://wpad/wpad.dat)
INFO [org.netbeans.core.network.proxy.NetworkProxyReloader]: System network proxy reloading succeeded.
INFO [org.netbeans.ui.metrics.laf]: USG_LOOK_AND_FEEL
WARNING [org.netbeans.core.network.proxy.ProxyAutoConfig]: There was a catastrophic error with the PAC script downloaded from http://wpad/wpad.dat. Will use dummy instead. Error was : 
org.netbeans.core.network.proxy.pac.PacParsingException: Cannot find secure PAC script engine.
Allowed engines: GraalVM:js,Graal.js,Nashorn
Found engines:
Will not resolve proxy configuration.
Brand ALLOWED_PAC_ENGINES key in org.netbeans.core.network.proxy.pac.impl.Bundle to configure.

	at org.netbeans.core.network.proxy.pac.impl.NbPacScriptEvaluator.getScriptEngine(NbPacScriptEvaluator.java:281)
	at org.netbeans.core.network.proxy.pac.impl.NbPacScriptEvaluator.<init>(NbPacScriptEvaluator.java:199)
	at org.netbeans.core.network.proxy.pac.impl.NbPacScriptEvaluatorFactory.createPacScriptEvaluator(NbPacScriptEvaluatorFactory.java:45)
[catch] at org.netbeans.core.network.proxy.ProxyAutoConfig.initEngine(ProxyAutoConfig.java:111)
	at org.netbeans.core.network.proxy.ProxyAutoConfig$1.run(ProxyAutoConfig.java:82)
	at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1418)
	at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:45)
	at org.openide.util.lookup.Lookups.executeWith(Lookups.java:278)
	at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)
INFO [org.netbeans.core.network.proxy.NetworkProxyReloader]: System network proxy - mode: auto
INFO [org.netbeans.core.network.proxy.NetworkProxyReloader]: System network proxy - pac url: http://wpad/wpad.dat
INFO [org.netbeans.core.network.proxy.NetworkProxyReloader]: System network proxy TEST - http host: 
INFO [org.netbeans.core.network.proxy.NetworkProxyReloader]: System network proxy TEST - http port: 0

[thurka]

Solved by bundling nashorn library with VisualVM.