Java Build Error when adding javax.smartcardio to project

Question

I am trying to add some simple smart card reader functionality to one of our applications and I keep getting a build error that I can't figure out, so I'm looking for input or any advice I can find that will help me get the project to compile after importing javax.smartcardio in one of the new classes.

I initially created a simple class with one string parsing method and a main method. As a standalone project, I can run the class just fine without errors and all of the expected info from the card reader and card gets printed to the console via System.out as expected, so I don't think there's any issues with the code that I have brought over to my project from this early test project.

But now that I've imported smartcardio into the new class, my project won't compile. I have tried removing and re-adding the JRE System library as suggested in several other posts here, but I think this might be a different issue. When compiling, it seems like the compiler isn't recognizing or can't find rt.jar even though I have checked repeatedly and the jar is there in the JRE folder.

Here's the error, any help is highly appreciated. Let me know if more info is needed.

[INFO] --- maven-antrun-plugin:1.7:run (compilegwt) @ hwslqc ---
[INFO] Executing tasks

main:
     [echo] GWT compilation: hwslqc
     [java] Compiling module com.prusa.hwslqc.hwslqc
     [java]    [ERROR] An internal compiler exception occurred
     [java] com.google.gwt.dev.jjs.InternalCompilerException: Failed to get JNode
     [java]     at com.google.gwt.dev.jjs.impl.TypeMap.get(TypeMap.java:140)
     [java]     at com.google.gwt.dev.jjs.impl.TypeMap.get(TypeMap.java:71)
     [java]     at com.google.gwt.dev.jjs.impl.BuildTypeMap.getType(BuildTypeMap.java:730)
     [java]     at com.google.gwt.dev.jjs.impl.BuildTypeMap.access$000(BuildTypeMap.java:99)
     [java]     at com.google.gwt.dev.jjs.impl.BuildTypeMap$BuildDeclMapVisitor.visit(BuildTypeMap.java:195)
     [java]     at org.eclipse.jdt.internal.compiler.ast.LocalDeclaration.traverse(LocalDeclaration.java:237)
     [java]     at org.eclipse.jdt.internal.compiler.ast.Block.traverse(Block.java:127)
     [java]     at org.eclipse.jdt.internal.compiler.ast.TryStatement.traverse(TryStatement.java:853)
     [java]     at org.eclipse.jdt.internal.compiler.ast.MethodDeclaration.traverse(MethodDeclaration.java:239)
     [java]     at org.eclipse.jdt.internal.compiler.ast.TypeDeclaration.traverse(TypeDeclaration.java:1239)
     [java]     at org.eclipse.jdt.internal.compiler.ast.CompilationUnitDeclaration.traverse(CompilationUnitDeclaration.java:687)
     [java]     at com.google.gwt.dev.jjs.impl.BuildTypeMap.createPeersForNonTypeDecls(BuildTypeMap.java:637)
     [java]     at com.google.gwt.dev.jjs.impl.BuildTypeMap.exec(BuildTypeMap.java:514)
     [java]     at com.google.gwt.dev.jjs.impl.BuildTypeMap.exec(BuildTypeMap.java:523)
     [java]     at com.google.gwt.dev.jjs.JavaToJavaScriptCompiler.precompile(JavaToJavaScriptCompiler.java:599)
     [java]     at com.google.gwt.dev.jjs.JavaScriptCompiler.precompile(JavaScriptCompiler.java:33)
     [java]     at com.google.gwt.dev.Precompile.precompile(Precompile.java:284)
     [java]     at com.google.gwt.dev.Precompile.precompile(Precompile.java:233)
     [java]     at com.google.gwt.dev.Precompile.precompile(Precompile.java:145)
     [java]     at com.google.gwt.dev.Compiler.run(Compiler.java:232)
     [java]     at com.google.gwt.dev.Compiler.run(Compiler.java:198)
     [java]     at com.google.gwt.dev.Compiler$1.run(Compiler.java:170)
     [java]     at com.google.gwt.dev.CompileTaskRunner.doRun(CompileTaskRunner.java:88)
     [java]     at com.google.gwt.dev.CompileTaskRunner.runWithAppropriateLogger(CompileTaskRunner.java:82)
     [java]     at com.google.gwt.dev.Compiler.main(Compiler.java:177)
     [java]       [ERROR] <no source info>: public final class javax.smartcardio.TerminalFactory
     [java]     extends java.lang.Object
     [java] /*   fields   */
     [java] private static final [unresolved] java.lang.String PROP_NAME
     [java] private static final [unresolved] java.lang.String defaultType
     [java] private static final [unresolved] javax.smartcardio.TerminalFactory defaultFactory
     [java] private final [unresolved] Unresolved type javax.smartcardio.TerminalFactorySpi spi
     [java] private final [unresolved] Unresolved type java.security.Provider provider
     [java] private final [unresolved] java.lang.String type
     [java] /*   methods   */
     [java] [unresolved] private void <init>(Unresolved type javax.smartcardio.TerminalFactorySpi, Unresolved type java.security.Provider, java.lang.String) 
     [java] public static javax.smartcardio.TerminalFactory getDefault() 
     [java] [unresolved] public static java.lang.String getDefaultType() 
     [java] [unresolved] public static javax.smartcardio.TerminalFactory getInstance(java.lang.String, java.lang.Object) throws java.security.NoSuchAlgorithmException
     [java] [unresolved] public static javax.smartcardio.TerminalFactory getInstance(java.lang.String, java.lang.Object, java.lang.String) throws java.security.NoSuchAlgorithmException, Unresolved type java.security.NoSuchProviderException
     [java] [unresolved] public static javax.smartcardio.TerminalFactory getInstance(java.lang.String, java.lang.Object, Unresolved type java.security.Provider) throws java.security.NoSuchAlgorithmException
     [java] [unresolved] public Unresolved type java.security.Provider getProvider() 
     [java] [unresolved] public java.lang.String getType() 
     [java] public javax.smartcardio.CardTerminals terminals() 
     [java] [unresolved] public java.lang.String toString() 
     [java] /*   members   */
     [java] Unresolved type javax.smartcardio.TerminalFactory$NoneCardTerminals
     [java] Unresolved type javax.smartcardio.TerminalFactory$NoneFactorySpi
     [java] Unresolved type javax.smartcardio.TerminalFactory$NoneProvider
     [java] 
     [java] 
     [java] 
     [java]       [ERROR] at SwipeCardUtil.java(48): TerminalFactory factory = TerminalFactory.getDefault();
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 38.721s

And here's the very simple classthat's causing the compilation error at line 48:

package com.prusa.hwslqc.client.ui.util;

import java.util.List;

import javax.smartcardio.Card;
import javax.smartcardio.CardException;
import javax.smartcardio.CardTerminal;
import javax.smartcardio.TerminalFactory;



/**
 * @author SWESTF01
 *
 */
@SuppressWarnings("restriction")
public class SwipeCardUtil 
{

    /**
     * @param theBytes
     * @return theByteArray as a hex string
     */
    public static String byteArrayToHexString(byte[] theBytes)          
    {             
        StringBuffer sb = new StringBuffer(theBytes.length * 2);             

        for (int i = 0; i < theBytes.length; i++) 
        {               
            int byteRead = theBytes[i] & 0xff;               
            if (byteRead < 16) 
            {                 
                sb.append('0');               
            }               
            sb.append(Integer.toHexString(byteRead));          
        }             
        return sb.toString().toUpperCase();          
     }

    /**
     */
    @SuppressWarnings("restriction")
    public static void readCard()
    {                 
        try 
        {
            // Show the list of available terminals
            TerminalFactory factory = TerminalFactory.getDefault();

            List<CardTerminal> terminals = factory.terminals().list();
            if (terminals.size() == 0) {
                System.out.println("No terminals found.");
                return;
            }
            System.out.println("Terminal: " + terminals.get(0).getName());

            // Get the first terminal in the list
            CardTerminal terminal = terminals.get(0);
            boolean cardHasBeenRead = false;

            if(!terminal.isCardPresent())
            {
                System.out.println("Please insert a card.");
            }

            //8 hours = 28800000
            //1 day = 86400000
            while(terminal.waitForCardPresent(86400000))
            {

                if(!cardHasBeenRead)
                {
                    // Establish a connection with the card using
                    // "T=0", "T=1", "T=CL" or "*"
                    Card card = terminal.connect("*");

                    System.out.println("Card: " + card);

                    // Get ATR
                    byte[] baATR = card.getATR().getBytes();

                    System.out.println("ATR: " + SwipeCardUtil.byteArrayToHexString(baATR));

                    // Disconnect
                    // true: reset the card after disconnecting card.
                    card.disconnect(true);
                    cardHasBeenRead = true;
                }

                if(!terminal.isCardPresent())
                {
                    cardHasBeenRead = false;
                    System.out.println("Please insert a card.");
                }
             }
        } 
        catch (CardException ex) {
            System.out.println("Please connect a Card Reader and restart the program.");
            ex.printStackTrace();
        }
    } 
}

Answer 1

Thank you Zoran Regvart ! Although you didn't really provide an answer, you helped me get there by seeing my own silly mistake!

I had added the SwipeCardUtil class to the wrong util folder in the project! By moving it from the client side util folder to the server side util folder, I was able to compile the project and continue my work. Thank you for opening my eyes!