JBoss中，啟動Applet連接EJB，出現(xiàn)java.net.MalformedURLException: unknown protocol: dummy異常
（其實還有一個Log4j的異常：
[java] log4j:WARN No appenders could be found for logger (org.jboss.security.SecurityAssociation).
[java] log4j:WARN Please initialize the log4j system properly.
）
解決：
查找您系統(tǒng)下是否有一個gnujaxp.jar文件，并刪除它。
The gnujaxp.jar file is most easily installed in$JAVA_HOME/jre/lib/ext; otherwise you may prefer to modify yourCLASSPATH. If you have other JAXP parsers installed you may also wishto set up $JAVA_HOME/jre/lib/jaxp.properties so the GNU JAXP driversare used by default:
# make JAXP clients prefer the GNU implementations
javax.xml.parsers.SAXParserFactory=gnu.xml.aelfred2.JAXPFactory
javax.xml.parsers.DocumentBuilderFactory=gnu.xml.dom.DomDocumentBuilderFactory
javax.xml.transform.TransformerFactory=gnu.xml.transform.TransformerFactoryImpl
javax.xml.xpath.XPathFactory=gnu.xml.xpath.XPathFactoryImpl
Alternatively, you may specify the use of the experimental libxmlj implementations, as follows:
javax.xml.parsers.SAXParserFactory=gnu.xml.libxmlj.sax.GnomeSAXParserFactory
javax.xml.parsers.DocumentBuilderFactory=gnu.xml.libxmlj.dom.GnomeDocumentBuilderFactory
javax.xml.transform.TransformerFactory=gnu.xml.libxmlj.transform.GnomeTransformerFactory
If you are using the portable SAX2 bootstrapping APIs, you may want toset the org.xml.sax.driver system property on each JVM invocation to begnu.xml.aelfred2.SAXDriver (non-validating) orgnu.xml.aelfred2.XmlReader (optionally validating). Otherwise theorg.xml.sax.helpers.XMLReaderFactory may not return the parser youexpect.
If using GNU JAXP as part of GNU Classpath, no configuration should be necessary.
附一些Log4j問題解決數(shù)參考的資料：
方案1：
你先將你程式內(nèi)部的 log4j.properties or log4j.xml 全部拿掉，再 deploy
看看。如果沒問題再逐一將 自己的 config 一項一項放進
\jboss\server\default\conf\log4j.xml 測試。
方案2：
application若有自己的log4j war及設(shè)定項，而導(dǎo)致JBoss啟動時出現(xiàn)"ERROR: invalid console appender config detected, console stream islooping." 錯誤信息時，只要去JBossserver里的conf資料夾中的jboss-service.xml中的org.jboss.logging.Log4jService的設(shè)定區(qū)段中加個參數(shù)：<attributename="CatchSystemOut">false</attribute>即可，如：
