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List of core Java source code

License: MIT License

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

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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.

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?

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

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