Java Applet in Firefox
Question
I am facing a weird problem in Testing server while using applet (using embed tag) in my ASP.NET MVC application Applet works fine locally in both browsers IE and Firefox but when deployed to Testing server its throwing below exception for Firefox only (IE works fine).
Please help me out in this
basic: exception: javax.xml.parsers.FactoryConfigurationError: Provider <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> not found.
java.lang.RuntimeException: javax.xml.parsers.FactoryConfigurationError: Provider <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> not found
at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: javax.xml.parsers.FactoryConfigurationError: Provider <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> not found
at javax.xml.parsers.DocumentBuilderFactory.newInstance(Unknown Source)
at org.apache.log4j.xml.DOMConfigurator.doConfigure(DOMConfigurator.java:772)
at org.apache.log4j.xml.DOMConfigurator.doConfigure(DOMConfigurator.java:696)
at org.apache.log4j.helpers.OptionConverter.selectAndConfigure(OptionConverter.java:471)
at org.apache.log4j.LogManager.<clinit>(LogManager.java:125)
at org.apache.log4j.Logger.getLogger(Logger.java:105)
Exception: java.lang.RuntimeException: javax.xml.parsers.FactoryConfigurationError: Provider <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> not found
Ignored exception: java.lang.RuntimeException: javax.xml.parsers.FactoryConfigurationError: Provider <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> not found
basic: Starting applet teardown
basic: Finished applet teardown
2 answers
solution1
1 2010-04-30 14:54:52
显然，log4j尝试访问某些XML配置文件，但无法在期望的位置找到它们。
solution2
0 2010-05-01 03:23:36
The problem is actually that the DTD cannot be found. This can be caused by access restrictions in the security box the applet is running in. IE is probably more flexible in this or has it actually in the client side cache.
That said, this indicates that the log4j XML configuration file is declared with a HTML doctype. Why is it there? It's a XML file, get rid of the HTML doctype. Just a XML declaration with eventually a log4j.dtd is enough.
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