Develop Reference

java class getResource can't find icons listed in jar file

I am really stumped. I'm just an old C X11/Motif programmer trying to write a little Java program. After a week of reading the Oracle Java Documentation, as well as the
Stack Overflow answers related to getResource, I still can not figure out how to retrieve the path to the icon files in my jar file.
My icons are contained within the jar file for my application. I wish to access them using the relative position within jar file. I am assuming the best way to do this is through the getResource method.
The core part of my code for my program called Fŭd (pronounced food - like the cat spells it in the comic strip "Get Fuzzy") is as follows:
package localhost.system1;
imports not shown for brevity.
public class Fud extends JPanel
implements FocusListener, ActionListener, ItemListener
{
private static final long serialVersionUID = 1L;
static Food data = null;
static int prev = 0;
static int next = 1;
static int plus = 2;
static int minus = 3;
public static void main(String args[]) throws Exception
{
LocalDate now = LocalDate.now();
int dateDifference = 0;
// load in the existing data
data = new Food(programName);
data.loadFood(programName);
// test to see if data is up to date. Add days if not
dateDifference = Math.abs((int)ChronoUnit.DAYS.between(now, data.day[0].date));
if ( dateDifference != 0)
{
data.adjustToToday(dateDifference, programName);
}
/////////////////////////////////////////////////
// create the GUI and switch running over to it.
/////////////////////////////////////////////////
Fud fud = new Fud();
Class<? extends Fud> fudClass = fud.getClass();
String className = fudClass.getName();
System.out.println("fudClass getname returns " + className);
URL testURL = fudClass.getResource("prev.png");
System.out.println("fudClass getResource returned " + testURL);
// Create GUI and turn the control over to it
javax.swing.SwingUtilities.invokeLater
(new Runnable()
{
public void run()
{
URL[] iconURL = new URL[4];
iconURL[prev] = Fud.class.getResource("prev.png");
iconURL[next] = Fud.class.getResource("next.png");
iconURL[plus] = Fud.class.getResource("plus.png");
iconURL[minus] = Fud.class.getResource("minus.png");
createAndShowGUI(fud, iconURL);
}
}
);
} // end of main
.
.
.
Rest of methods and subroutines needed
.
.
.
}
When run, the code returns the following results:
fudClass getname returns localhost.system1.Fud
fudClass getResource returned null
This has me quite frustrated. No matter what I try (and I have tried a number of things) the result remains the same. I keep getting NULL for a response from the getResource method. When I query the jar file with jar -tf Fud.jar I get the following:
jar tf Fud.jar
META-INF/MANIFEST.MF
localhost/
localhost/system1/
localhost/system1/Day.class
localhost/system1/Food.class
localhost/system1/Fud$1.class
localhost/system1/Fud$2.class
localhost/system1/Fud$3.class
localhost/system1/Fud$4.class
localhost/system1/Fud$5.class
localhost/system1/Fud$6.class
localhost/system1/Fud$7.class
localhost/system1/Fud.class
minus.png
next.png
plus.png
prev.png
So the icons are in the Jar file. Can anyone tell me what I am doing wrong? In Eclipse, my project explorer looks like:eclipse Project Explorer
I added the Image directory to my project Java build in eclipse as follows: Eclipse Java Build
I built the program using Eclipse Version: 2021-12 (4.22.0) Build id: 20211202-1639. Furthermore, I am using Java 17.0.1 2021-10-19 LTS on Windows 11 Pro build 22000.434.

You have to add a slash in front of the resource:
Fud.class.getResource("/prev.png");
otherwise java searching in the same folder as the class is located,
so it will search in localhost/system1

IBM Watson Speech to Text Only Returning First Word With Java SDK

I'm using the IBM Watson speech to text Java SDK, and when I upload the .wav file the response JSON only contains the first transcribed word. When I upload the same file to the web demo, I get the full response.
Very simple implementation with the SDK:
SpeechToText service = new SpeechToText();
service.setUsernameAndPassword("<username>", "<password>");
File audio = new File("src/test/resources/sample1.wav");
SpeechResults transcript = service.recognize(audio, HttpMediaType.AUDIO_WAV);
System.out.println(transcript);

The recognize() signature you are using will return after the first pause. To see all of the results do this:
RecognizeOptions options = new RecognizeOptions();
options = options.continuous(true)
.contentType(HttpMediaType.AUDIO_WAV)
.interimResults(false)
.inactivityTimeout(10)
.maxAlternatives(1)
.wordConfidence(false)
.timestamps(true)
.model("en-US_BroadbandModel");
SpeechResults transcript = service.recognize(audio, options);
This works for me using the following maven dependency:
<dependency>
<groupId>com.ibm.watson.developer_cloud</groupId>
<artifactId>java-sdk</artifactId>
<version>2.8.0</version>
</dependency>

I am trying quite the same thing, using the same parameters described by Chris K. (except for "interim results = true")
FileInputStream audio = new FileInputStream("/home/leoks/BM/ws/mp32wav/out.wav");
RecognizeOptions options = new RecognizeOptions();
options = options.continuous(true)
.contentType(HttpMediaType.AUDIO_WAV)
.interimResults(true)
.inactivityTimeout(10)
.maxAlternatives(1)
.wordConfidence(false)
.timestamps(true)
.model("en-US_BroadbandModel");
api.stt.recognizeUsingWebSockets(audio, options, new BaseRecognizeDelegate() {
#Override
public void onMessage(SpeechResults speechResults) {
System.out.println(speechResults);
try{
if (speechResults != null && speechResults.isFinal()){
lock.countDown();
}
}catch(java.lang.IndexOutOfBoundsException ignored){
}
}
});
lock.await(5, TimeUnit.SECONDS);
However, it still throws an exception
java.lang.NullPointerException
at java.io.StringReader.<init>(StringReader.java:50)
at com.google.gson.JsonParser.parse(JsonParser.java:45)
at com.ibm.watson.developer_cloud.speech_to_text.v1.websocket.WebSocketSpeechToTextClient$WebSocketListener.onTextMessage(WebSocketSpeechToTextClient.java:66)
at com.neovisionaries.ws.client.ListenerManager.callOnTextMessage(ListenerManager.java:352)
at com.neovisionaries.ws.client.ReadingThread.callOnTextMessage(ReadingThread.java:233)
at com.neovisionaries.ws.client.ReadingThread.callOnTextMessage(ReadingThread.java:211)
at com.neovisionaries.ws.client.ReadingThread.handleTextFrame(ReadingThread.java:910)
at com.neovisionaries.ws.client.ReadingThread.handleFrame(ReadingThread.java:693)
at com.neovisionaries.ws.client.ReadingThread.main(ReadingThread.java:102)
at com.neovisionaries.ws.client.ReadingThread.run(ReadingThread.java:61)
java.lang.NullPointerException
at java.io.StringReader.<init>(StringReader.java:50)
at com.google.gson.JsonParser.parse(JsonParser.java:45)
at com.ibm.watson.developer_cloud.speech_to_text.v1.websocket.WebSocketSpeechToTextClient$WebSocketListener.onTextMessage(WebSocketSpeechToTextClient.java:66)
at com.neovisionaries.ws.client.ListenerManager.callOnTextMessage(ListenerManager.java:352)
at com.neovisionaries.ws.client.ReadingThread.callOnTextMessage(ReadingThread.java:233)
at com.neovisionaries.ws.client.ReadingThread.callOnTextMessage(ReadingThread.java:211)
at com.neovisionaries.ws.client.ReadingThread.handleTextFrame(ReadingThread.java:910)
at com.neovisionaries.ws.client.ReadingThread.handleFrame(ReadingThread.java:693)
at com.neovisionaries.ws.client.ReadingThread.main(ReadingThread.java:102)
at com.neovisionaries.ws.client.ReadingThread.run(ReadingThread.java:61)
java.lang.NullPointerException
at java.io.StringReader.<init>(StringReader.java:50)
at com.google.gson.JsonParser.parse(JsonParser.java:45)
at com.ibm.watson.developer_cloud.speech_to_text.v1.websocket.WebSocketSpeechToTextClient$WebSocketListener.onTextMessage(WebSocketSpeechToTextClient.java:66)
at com.neovisionaries.ws.client.ListenerManager.callOnTextMessage(ListenerManager.java:352)
at com.neovisionaries.ws.client.ReadingThread.callOnTextMessage(ReadingThread.java:233)
at com.neovisionaries.ws.client.ReadingThread.callOnTextMessage(ReadingThread.java:211)
at com.neovisionaries.ws.client.ReadingThread.handleTextFrame(ReadingThread.java:910)
at com.neovisionaries.ws.client.ReadingThread.handleFrame(ReadingThread.java:693)
at com.neovisionaries.ws.client.ReadingThread.main(ReadingThread.java:102)
at com.neovisionaries.ws.client.ReadingThread.run(ReadingThread.java:61)
which seems to be related to this issue
https://github.com/watson-developer-cloud/java-sdk/issues/205
that is set to be reached in milestone 2.9.0 (current is 2.8.0)

Java grph library: Exception on toools.os.OperatingSystem.getLocalOS()

I'm using grph library for a university project (www.i3s.unice.fr/~hogie/grph/)
but i have a problem only on Linux with that library, when i create a new Graph object, i receive the following exception:
Exception in thread "main" java.lang.ExceptionInInitializerError
at org.elendev.wesproject.graph.GraphFactory.main(GraphFactory.java:19)
Caused by: java.lang.NullPointerException
at toools.os.OperatingSystem.getLocalOS(OperatingSystem.java:47)
at grph.Grph.setCompilationDirectory(Grph.java:353)
at grph.Grph.<clinit>(Grph.java:246)
... 1 more
I tried to call directly getLocalOS function, with:
System.out.println(toools.os.OperatingSystem.getLocalOS());
and i receive the same exception. I cannot find information about that library, and the project launched on a macbook works perfectly.
The operating system i'm currently using is gentoo linux 32bit.
And the jdk version is: 1.7.0_65
Any idea of what could be the problem?

Not sure whether this can count as an answer, but it could at least help to solve the issue:
The exception comes from the toools.os.OperatingSystem.getLocalOS method. Although the .JAR file from the website that you mentioned has a whopping 39 megabytes, the source code of this class is not contained in it.
There seems to be no information available about this class at all. Neither Google nor Maven finds anything related to the toools package. One has to assume that it is an abandoned utility class that passed away a long time ago.
However, the method in question can be disassembled to the following code:
public static OperatingSystem getLocalOS()
{
if (localOS == null)
{
if (new RegularFile("/etc/passwd").exists())
{
if (new Directory("/proc").exists())
{
if (new RegularFile("/etc/fedora-release").exists()) {
localOS = new FedoraLinux();
} else if (ExternalProgram.commandIsAvailable("ubuntu-bug")) {
localOS = new UbuntuLinux();
} else {
localOS = new Linux();
}
}
else if (new Directory("/Applications").exists()) {
localOS = new MacOSX();
} else {
localOS = new Unix();
}
}
else if (System.getProperty("os.name").startsWith("Windows")) {
localOS = new Windows();
} else {
localOS = new OperatingSystem();
}
localOS.name = System.getProperty("os.name");
localOS.version = System.getProperty("os.version");
}
return localOS;
}
From this, you can possibly derive the conditions that must be met in order to properly detect your OS as a linux OS. Particularly, when there is a file named /etc/passwd, and a directory /proc, this should be sufficient to identify the OS as a Linux. You may want to give it a try...

Integrating MaltParser into java code, without using a separate process

There are several resources already available for training and executing the grammatical dependency parser, MaltParser; most notably is the project's homepage: http://www.maltparser.org/userguide.html#startusing). And looking at the NLTK code that uses MaltParser, I see how I could write equivalent Java code to start up a separate child process to run MaltParser: http://nltk.org/_modules/nltk/parse/malt.html. However, what I am asking, or rather looking for, is code that clearly and cleanly shows how to integrate MaltParser as a library into a Java program.
To be specific, I want to write Java code to do the following:
Train a parsing model.
Load a trained model and parse sentences in an online fashion (i.e. stream sentences and use a MaltParser object to parse each one).
To whomever has the knowledge, patience, and willingness: please to help me answer 1 and 2!

I found a rudimentary solution to 2. I noticed that on http://www.maltparser.org/userguide.html#api it directs one to a listing of example files. I took this snippet out of one of those files:
/**
* #author Johan Hall
*/
public static void main(String[] args) {
try {
MaltParserService service = new MaltParserService();
// Inititalize the parser model 'model0' and sets the working directory to '.' and sets the logging file to 'parser.log'
service.initializeParserModel("-c model0 -m parse -w . -lfi parser.log");
// Creates an array of tokens, which contains the Swedish sentence 'Grundavdraget upphör alltså vid en taxerad inkomst på 52500 kr.'
// in the CoNLL data format.
String[] tokens = new String[11];
tokens[0] = "1\tGrundavdraget\t_\tN\tNN\tDD|SS";
tokens[1] = "2\tupphör\t_\tV\tVV\tPS|SM";
tokens[2] = "3\talltså\t_\tAB\tAB\tKS";
tokens[3] = "4\tvid\t_\tPR\tPR\t_";
tokens[4] = "5\ten\t_\tN\tEN\t_";
tokens[5] = "6\ttaxerad\t_\tP\tTP\tPA";
tokens[6] = "7\tinkomst\t_\tN\tNN\t_";
tokens[7] = "8\tpå\t_\tPR\tPR\t_";
tokens[8] = "9\t52500\t_\tR\tRO\t_";
tokens[9] = "10\tkr\t_\tN\tNN\t_";
tokens[10] = "11\t.\t_\tP\tIP\t_";
// Parses the Swedish sentence above
DependencyStructure graph = service.parse(tokens);
// Outputs the dependency graph created by MaltParser.
System.out.println(graph);
// Terminates the parser model
service.terminateParserModel();
} catch (MaltChainedException e) {
System.err.println("MaltParser exception: " + e.getMessage());
}
}

How to implement a Java compiler and DEX converter into an Android app?

While trying to find an answer to Android Jasper Reporting I found out that there are two other questions to be answered therefor, which I been asked to ask as a question, not as an answer ;):
My questions are now: "Is there any compiler to use directly on the device" AND "how to execute such without rooting the device.
If anybody could give me a hint I would really appreciate it...
I looked a little time forward on this approach, and found apps which makes it possible to create APKs directly on an Android device which is NOT rooted:
TerminalIDE - https://play.google.com/store/apps/details?id=com.spartacusrex.spartacuside&hl=de
JavaIDEdroid - http://code.google.com/p/java-ide-droid/
AIDE - https://play.google.com/store/apps/details?id=com.aide.ui&hl=en
Looks like they're using the compiler from eclipse and a ported dex converter. Now I'm trying to figure out how to do the same.
Sure: get the source code and look into it. But while I'm having curious problems to get a connection to the servers and trying to solve it, I follow the plea to ask this question here. Hoping both to help others with it and also getting an answer for myself ;)
I took the org.eclipse.jdt.core_3.7.3.v20120119-1537.jar from the plugin directory of my indigo and tried following code:
org.eclipse.jdt.internal.compiler.batch.Main ecjMain = new org.eclipse.jdt.internal.compiler.batch.Main(new PrintWriter(System.out), new PrintWriter(System.err), false/*noSystemExit*/, null, progress);
System.err.println("compiling...");
ecjMain.compile(new String[] {"-classpath", "/system/framework", storage.getAbsolutePath()+"/Test.java"});
ecjMain.compile(new String[] {storage.getAbsolutePath()+"/Test.java"});
System.err.println("compile succeeded!!!");
Sometimes the Exception was thrown that java.lang.Object could not be found and othertimes it stuck doing nothing while heating up my processor with 100% usage ... ...
At this time i could not figure out what is happening and why. And in cause that i have other work to do this part has to wait a little.

I succeeded after taking inspiration from source of JavaIDEdroid and realizing that I'm dumb (for a time I tried to uses the compiler with the dexified framework classes on the device - which naturtally could not work).
After i succeeded compiling my Test.java with a copy of ADTs android-jar on sdcard I just had to load the classes with the DexClassLoader.
While informing myselft about how to do that I found this nice article Custom Class Loading in Dalvik which inspired me at least to write this piece of code:
File storage = getDir("all41", Context.MODE_PRIVATE);
System.err.println("copying the android.jar from asssets to the internal storage to make it available to the compiler");
BufferedInputStream bis = null;
OutputStream dexWriter = null;
int BUF_SIZE = 8 * 1024;
try {
bis = new BufferedInputStream(getAssets().open("android.jar"));
dexWriter = new BufferedOutputStream(
new FileOutputStream(storage.getAbsolutePath() + "/android.jar"));
byte[] buf = new byte[BUF_SIZE];
int len;
while((len = bis.read(buf, 0, BUF_SIZE)) > 0) {
dexWriter.write(buf, 0, len);
}
dexWriter.close();
bis.close();
} catch (Exception e) {
System.err.println("Error while copying from assets: " + e.getMessage());
e.printStackTrace();
}
System.err.println("instantiating the compiler and compiling the java file");
org.eclipse.jdt.internal.compiler.batch.Main ecjMain = new org.eclipse.jdt.internal.compiler.batch.Main(new PrintWriter(System.out), new PrintWriter(System.err), false/*noSystemExit*/, null);
ecjMain.compile(new String[] {"-classpath", storage.getAbsolutePath()+"/android.jar", Environment.getExternalStorageDirectory().getAbsolutePath() + "/Test.java"});
System.err.println("calling DEX and dexifying the test class");
com.android.dx.command.Main.main(new String[] {"--dex", "--output=" + storage.getAbsolutePath() + "/Test.zip", Environment.getExternalStorageDirectory().getAbsolutePath() + "/./Test.class"});
System.err.println("instantiating DexClassLoader, loading class and invoking toString()");
DexClassLoader cl = new DexClassLoader(storage.getAbsolutePath() + "/Test.zip", storage.getAbsolutePath(), null, getClassLoader());
try {
Class libProviderClazz = cl.loadClass("Test");
Object instance = libProviderClazz.newInstance();
System.err.println(instance.toString());
} catch (Exception e) {
System.err.println("Error while instanciating object: " + e.getMessage());
e.printStackTrace();
}
The Test.java only contains one method:
public String toString() {
return "Hallo Welt!";
}
To get it running you need the jars jdt-compiler-x.x.x.jar (found in plugins directory of eclipse) and dx.jar (found in directory platform-tools/lib of Android SDK)
Not really hard ;) And now I will find out what to change in source of JasperReports to get it work on our beloved Android devices :D