A DESCRIPTION OF THE PROBLEM :
The test failed with unexpected StringIndexOutOfBoundsException.
such is also in https://github.com/openjdk/jdk/commit/e341e35276315a5140ddec11a7e659d57328e9a0
We think you can replace charAt(0) with startsWith to avoid StringIndexOutOfBoundsException.

ACTUAL -
java.lang.StringIndexOutOfBoundsException: String index out of range: 0

at java.lang.String.charAt(String.java:658)
at com.sun.org.apache.xerces.internal.impl.XMLDTDScannerImpl.startEntity(XMLDTDScannerImpl.java:586)

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@Test
    public void test_startEntity_2_2() throws com.sun.org.apache.xerces.internal.xni.XNIException{

        String string1 = "";
        com.sun.org.apache.xerces.internal.xni.XMLResourceIdentifier xMLResourceIdentifier2 = null;
        String string3 = "a ";
        com.sun.org.apache.xerces.internal.xni.Augmentations augmentations4 = null;
        com.sun.org.apache.xerces.internal.util.SymbolTable symbolTable5 = new com.sun.org.apache.xerces.internal.util.SymbolTable();
        XMLErrorReporter xMLErrorReporter6 = new XMLErrorReporter();
        XMLEntityManager xMLEntityManager7 = new XMLEntityManager();
        XMLDTDScannerImpl xMLDTDScannerImpl0 = new XMLDTDScannerImpl(symbolTable5, xMLErrorReporter6, xMLEntityManager7);
        xMLDTDScannerImpl0.startEntity(string1, xMLResourceIdentifier2, string3, augmentations4);
    }
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