mkyong / core-java Goto Github PK

List of core Java source code

License: MIT License

Java 99.73% Shell 0.03% HTML 0.06% XSLT 0.18%

core-java's Issues

xml crashes when running on eclipse 06-2023 with Java 19

I have java19 and 20 installed on Eclipse 06-2023. I also installed maven with your pom.xml. Here are the issues.
1). Alexa.com disabled their service around 2021/2022. Thus the two alexa java files crash when running as java application regardless in run on maven setup or the JDT default Eclips 06-2023.
2). The following three files ReadXmlParser, ReadXmlParserLoop and ReadXmSaxParser2 will work in a Maven setup but will not run in a default JDT Eclipse 06-2023 setup with java 19 and all the java file dependencies imported one-by-one.

ReadXmlParser

Exception in thread "main" java.lang.IllegalArgumentException: InputStream cannot be null
	at java.xml/javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:118)
	at com.mkyong.xml.dom.ReadXmlDomParser.main(ReadXmlDomParser.java:36)

ReadXmlParserLoop

Exception in thread "main" java.lang.IllegalArgumentException: InputStream cannot be null
	at java.xml/javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:118)
	at com.mkyong.xml.dom.ReadXmlDomParserLoop.main(ReadXmlDomParserLoop.java:30)

ReadXmlSaxParser2

java.net.MalformedURLException: Cannot invoke "String.length()" because "spec" is null
	at java.base/java.net.URL.<init>(URL.java:798)
	at java.base/java.net.URL.<init>(URL.java:646)
	at java.base/java.net.URL.<init>(URL.java:582)
	at java.xml/com.sun.org.apache.xerces.internal.impl.XMLEntityManager.setupCurrentEntity(XMLEntityManager.java:651)
	at java.xml/com.sun.org.apache.xerces.internal.impl.XMLVersionDetector.determineDocVersion(XMLVersionDetector.java:150)
	at java.xml/com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:861)
	at java.xml/com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:825)
	at java.xml/com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
	at java.xml/com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1224)
	at java.xml/com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:637)
	at com.mkyong.xml.sax.ReadXmlSaxParser2.main(ReadXmlSaxParser2.java:45)
Caused by: java.lang.NullPointerException: Cannot invoke "String.length()" because "spec" is null
	at java.base/java.net.URL.<init>(URL.java:704)
	... 10 more

3). The ReadXmlSaxParserXXE will not run on a maven setup using your pom.xml file, nor on the defaul JDT Eclipse 06-2023 install.

Start Document
org.xml.sax.SAXParseException; systemId: file:///C:/Users/myinc/eclipse-workspace/Lang_Java/Java_Code/src/main/resources/staff-xxe.xml; lineNumber: 2; columnNumber: 10; DOCTYPE is disallowed when the feature "http://apache.org/xml/features/disallow-doctype-decl" set to true.
	at java.xml/com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:204)
	at java.xml/com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(ErrorHandlerWrapper.java:178)
	at java.xml/com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:400)
	at java.xml/com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:327)
	at java.xml/com.sun.org.apache.xerces.internal.impl.XMLScanner.reportFatalError(XMLScanner.java:1465)
	at java.xml/com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:898)
	at java.xml/com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:605)
	at java.xml/com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:542)
	at java.xml/com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:889)
	at java.xml/com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:825)
	at java.xml/com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
	at java.xml/com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1224)
	at java.xml/com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:637)
	at java.xml/com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl.parse(SAXParserImpl.java:326)
	at java.xml/javax.xml.parsers.SAXParser.parse(SAXParser.java:276)
	at com.mkyong.xml.sax.ReadXmlSaxParserXXE.main(ReadXmlSaxParserXXE.java:32)

Other than this, the result of the java files will run on both the maven setup and the default JDT setup for Eclipse 06-2023.
I'm still pretty new to Eclipse, and looking at these example files to see how these work.

java-xml/PrintAllHandlerSax incorrect handling of nested nodes

When you add printing value of staff node, it turns out that it has the value of the last nested node (bio):

@Override
    public void endElement(String uri,
                           String localName,
                           String qName) {
...
        if (qName.equalsIgnoreCase("staff")) {
            System.out.printf("staff : %s%n", currentValue.toString());
        }
}

console before:

End Element : bio
Bio : HTML tag <code>testing</code>
End Element : staff
Start Element : staff
Staff id : 1002

console after:

Bio : HTML tag <code>testing</code>
End Element : staff
staff : HTML tag <code>testing</code>
Start Element : staff
Staff id : 1002

Reading file exception

Reading the File works when app is executed from the IDE, but if you compile and execute:

javac Main.java
java Main

then it throws:

Exception in thread "main" java.lang.IllegalArgumentException: File: app.log not found.
	at ResourceHelper.getAbsoluteFilePath(ResourceHelper.java:11)
	at Main.main(Main.java:15)

ResourceHelper.java:

public class ResourceHelper {

    public static String getAbsoluteFilePath(String filename) {
        URL resource = ClassLoader.getSystemClassLoader().getResource(filename);
        if (resource == null) {
            throw new IllegalArgumentException("File: " + filename + " not found.");
        }

        try {
            Path path = Paths.get(resource.toURI());
            return path.toString();
        } catch (URISyntaxException e) {
            throw new IllegalArgumentException(e.getMessage());
        }
    }

}

Any suggestion to solve this?

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