[rfc][icedtea-web] Ensure JarFile handles do not leak, introduce closeSilently utility

[Adam Domurad]

On 02/12/2013 04:55 PM, Adam Domurad wrote:
> This squelches some Eclipse warnings.
>
>> 2013-XX-XX  Adam Domurad <adomurad at redhat.com>
>>
>>     Ensure JarFile handles do not leak.
>>     * netx/net/sourceforge/jnlp/util/StreamUtils.java:
>>     New, introduces 'closeSilently'. Ignores nulls & exceptions when
>>     closing.
>>     * netx/net/sourceforge/jnlp/runtime/JNLPClassLoader.java:
>>     Ensure StreamUtils.closeSilently or close is called for each
>>     JarFile.

OK that patch had a bug in it, and was probably too paranoid. This ones 
better.

Turns out JNLPClassLoader already had a closeStreams utility function.

2013-XX-XX  Adam Domurad  <adomurad at redhat.com>

     Ensure JarFile handles do not leak.
     * netx/net/sourceforge/jnlp/runtime/JNLPClassLoader.java:
     Ensure close is called for each JarFile.

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