about SAXparseException: content is not allowed in prolog

I am using glassfish server and the following error keeps coming:

Caused by: org.xml.sax.SAXParseException: Content is not allowed in prolog.
        at com.sun.enterprise.deployment.io.DeploymentDescriptorFile.read(DeploymentDescriptorFile.java:304)
        at com.sun.enterprise.deployment.io.DeploymentDescriptorFile.read(DeploymentDescriptorFile.java:226)
        at com.sun.enterprise.deployment.archivist.Archivist.readStandardDeploymentDescriptor(Archivist.java:480)
        at com.sun.enterprise.deployment.archivist.Archivist.readDeploymentDescriptors(Archivist.java:305)
        at com.sun.enterprise.deployment.archivist.Archivist.open(Archivist.java:213)
        at com.sun.enterprise.deployment.archivist.ApplicationArchivist.openArchive(ApplicationArchivist.java:813)
        at com.sun.enterprise.instance.WebModulesManager.getDescriptor(WebModulesManager.java:395)
        ... 65 more开发者_运维技巧

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Check this link

http://mark.koli.ch/2009/02/resolving-orgxmlsaxsaxparseexception-content-is-not-allowed-in-prolog.html

In short, some XML file contains the three-byte pattern (0xEF 0xBB 0xBF) at the front (right before <?xml ...?>), which is the UTF-8 byte order mark. The java's default XML parser can't handle this case.

The quick and dirty solution is to remove the white space at the front of the XML file:

String xml = "<?xml ...";
xml = xml.replaceFirst("^([\\W]+)<","<");

note that the String.trim() dost not enough, since it only trim the limited whitespace characters.