Java 1.5 JNI and C++ exception
Hello, All
I've troubles with handling C++ exceptions using JNI and shared library. I'm using Java 1.5_06, RedHat 7.3 and JBoss 4.0.5
From Java class I call JNI a method in my shared library(libx.so) which calls a method in other shared library(liby.so). Liby.so uses Xerces library. During parsing process an exception occurs. But according to Xerces sources it's a normal behavior and should be caught. But instead I've got SIGNABRT in JVM and a core dump will created. What's wrong? Backtrace shows similar something:
XXXXX __default_terminate() ....
XXXXX __terminate() ....
XXXXX __throws
XXXXX C++ method ..
XXXXX.....
XXXXX.....
XXXXX JNI methodI found similar bugs reports in the forum. But they says about Java 1.4 version and according to bugs descriptions it should be already fixed.
Message was edited by:
kostik78
The question is closed. The root cause was incorrect building of shared library.
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bstrt bstrLastErrorNumber = bstrt();
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jlong jLastPaymentAmount = NULL;
jstring jLastPaymentDate = NULL;
jstring jLastErrorMessage = NULL;
jstring jLastErrorNumber = NULL;
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const char *chLastErrorMessage = NULL;
const char *chLastErrorNumber = NULL;
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Edited by: Cthulhu76 on Jan 5, 2010 9:18 AM0x49202400 JavaThread "ContainerBackgroundProcessor[StandardEngine[Catalina]]" daemon [_thread_blocked, id=5340, stack(0x49bf0000,0x49c40000)]
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0x48a09000 JavaThread "CompilerThread0" daemon [_thread_blocked, id=4988, stack(0x48c10000,0x48c60000)]
0x48a07c00 JavaThread "Attach Listener" daemon [_thread_blocked, id=3124, stack(0x48bc0000,0x48c10000)]
0x48a07000 JavaThread "Signal Dispatcher" daemon [_thread_blocked, id=2572, stack(0x48b70000,0x48bc0000)]
0x489f5c00 JavaThread "Finalizer" daemon [_thread_blocked, id=5752, stack(0x48b20000,0x48b70000)]
0x489f4c00 JavaThread "Reference Handler" daemon [_thread_blocked, id=2596, stack(0x48ad0000,0x48b20000)]
0x003c6000 JavaThread "main" [_thread_in_native, id=4252, stack(0x00820000,0x00870000)]
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0x489f0400 VMThread [stack: 0x48a80000,0x48ad0000] [id=5624]
0x48a18800 WatcherThread [stack: 0x48cb0000,0x48d00000] [id=1192]
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VM Mutex/Monitor currently owned by a thread: None
Heap
def new generation total 36288K, used 12762K [0x02940000, 0x050a0000, 0x07800000)
eden space 32256K, 34% used [0x02940000, 0x0343af58, 0x048c0000)
from space 4032K, 37% used [0x04cb0000, 0x04e2ba28, 0x050a0000)
to space 4032K, 0% used [0x048c0000, 0x048c0000, 0x04cb0000)
tenured generation total 483968K, used 7518K [0x07800000, 0x250a0000, 0x42940000)
the space 483968K, 1% used [0x07800000, 0x07f57958, 0x07f57a00, 0x250a0000)
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the space 14080K, 99% used [0x42940000, 0x436f0320, 0x436f0400, 0x43700000)
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0x00400000 - 0x0040f000 C:\Program Files\Apache Software Foundation\Tomcat 5.5\bin\tomcat5.exe
0x7c800000 - 0x7c8c0000 C:\WINDOWS\system32\ntdll.dll
0x77e40000 - 0x77f42000 C:\WINDOWS\system32\kernel32.dll
0x77380000 - 0x77411000 C:\WINDOWS\system32\USER32.dll
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0x77f50000 - 0x77feb000 C:\WINDOWS\system32\ADVAPI32.dll
0x77c50000 - 0x77cef000 C:\WINDOWS\system32\RPCRT4.dll
0x76f50000 - 0x76f63000 C:\WINDOWS\system32\Secur32.dll
0x77ba0000 - 0x77bfa000 C:\WINDOWS\system32\MSVCRT.dll
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0x76290000 - 0x762ad000 C:\WINDOWS\system32\IMM32.DLL
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0x76aa0000 - 0x76acd000 C:\WINDOWS\system32\WINMM.dll
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0x6d310000 - 0x6d32f000 C:\Program Files\Java\jre1.6.0_07\bin\java.dll
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0x71bf0000 - 0x71bf8000 C:\WINDOWS\system32\WS2HELP.dll
0x71b20000 - 0x71b61000 C:\WINDOWS\system32\mswsock.dll
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0x77670000 - 0x777a9000 C:\WINDOWS\system32\ole32.dll
0x77d00000 - 0x77d8b000 C:\WINDOWS\system32\OLEAUT32.dll
0x7c420000 - 0x7c4a7000 C:\WINDOWS\WinSxS\x86_Microsoft.VC80.CRT_1fc8b3b9a1e18e3b_8.0.50727.4053_x-ww_E6967989\MSVCP80.dll
0x78130000 - 0x781cb000 C:\WINDOWS\WinSxS\x86_Microsoft.VC80.CRT_1fc8b3b9a1e18e3b_8.0.50727.4053_x-ww_E6967989\MSVCR80.dll
0x777b0000 - 0x77833000 C:\WINDOWS\system32\CLBCatQ.DLL
0x77010000 - 0x770d6000 C:\WINDOWS\system32\COMRes.dll
0x77b90000 - 0x77b98000 C:\WINDOWS\system32\VERSION.dll
0x75da0000 - 0x75e5d000 C:\WINDOWS\system32\SXS.DLL
0x75e60000 - 0x75e87000 C:\WINDOWS\system32\apphelp.dll
0x4dc30000 - 0x4dc5e000 C:\WINDOWS\system32\msctfime.ime
0x4b0d0000 - 0x4b395000 C:\WINDOWS\system32\xpsp2res.dll
0x71bb0000 - 0x71bb9000 C:\WINDOWS\system32\WSOCK32.dll
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0x745e0000 - 0x7489e000 C:\WINDOWS\system32\msi.dll
0x71c40000 - 0x71c97000 C:\WINDOWS\system32\NETAPI32.dll
0x4bc50000 - 0x4bc6c000 C:\WINDOWS\system32\DBNETLIB.DLL
0x71f60000 - 0x71f64000 C:\WINDOWS\system32\security.dll
0x76c90000 - 0x76cb7000 C:\WINDOWS\system32\msv1_0.dll
0x76cf0000 - 0x76d0a000 C:\WINDOWS\system32\iphlpapi.dll
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0x76190000 - 0x761a2000 C:\WINDOWS\system32\MSASN1.dll
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0x4a950000 - 0x4a9e2000 C:\Program Files\Common Files\System\ado\msado15.dll
0x74a50000 - 0x74a6a000 C:\WINDOWS\system32\MSDART.DLL
0x4c850000 - 0x4c8c9000 C:\Program Files\Common Files\System\Ole DB\oledb32.dll
0x4dbb0000 - 0x4dbc1000 C:\Program Files\Common Files\System\Ole DB\OLEDB32R.DLL
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java_command: <unknown>
Launcher Type: generic
Environment Variables:
JAVA_HOME=C:\Program Files\Java\jdk1.6.0_07
[error occurred during error reporting (printing environment variables), id 0xc0000005]
--------------- S Y S T E M ---------------
OS: Windows Server 2003 family Build 3790 Service Pack 2
CPU:total 4 (4 cores per cpu, 1 threads per core) family 6 model 7 stepping 6, cmov, cx8, fxsr, mmx, sse, sse2, sse3, ssse3
Memory: 4k page, physical 2097151k(2097151k free), swap 4194303k(4194303k free)
vm_info: Java HotSpot(TM) Client VM (10.0-b23) for windows-x86 JRE (1.6.0_07-b06), built on Jun 10 2008 01:14:11 by "java_re" with MS VC++ 7.1
time: Mon Dec 28 15:24:00 2009
elapsed time: 600 seconds -
Hi,
At my job, we seem to have a memory leak related to JNI. We know we
have a memory leak because we keep getting Out of Memory errors even
after increasing the maximum heap size to more than 256 megs. And we
know that this is the application that is eating up all the system
memory.
We are running under Windows 2000, with both JDK 1.3.0 and JDK 1.4.1.
We tried looking at the problem under JProbe, but it shows a stable
Java heap (no problems, except that the Windows task manager shows it
growing and growing...)
I tried a strip down version, where I set the max heap size to 1 Meg,
and print out the total memory, memory used, and maximum memory used at
a 5 sec interval.
Memory used = Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory().
Well, I let that strip down version running for about a day. The
maximum memory used has stabilized to about 1.1 Meg, and has not
increased. The current memory used increases until it gets to some
threshold, then it decreases again. However, the Windows task manager
shows the memory increasing -- and currently it is at 245 Megs!
In the lab, the behavior we see with the Windows task manager is as
follows:
1. Total memory used in the system increases until some threshold.
2. Then it goes back down by about 100 Megs.
3. This cycle continues, but at each cycle the memory goes back down
less and less, until the app crashes.
Now, our theory is that JNI is consuming all this memory (maybe we are
using JNI wrong). That's the only explanation we can come up with to
explain what we have seen (Java showing an OK heap, but the task
manager showing it growing, until crashing).
Does that make sense? Can the new operator throw an Out of Memory
error if the system does not have enough memory to give it, even if
there is still free heap space as far as the Runtime object is
concerned? Does the Runtime object figures objects allocated through
JNI methods into the heap used space?
Note that I know the task manager is not a reliable indicator.
However, I don't think a Java app is supposed to runaway with system
memory -- the problem is not simply that the Java app is consuming too
much memory, but that it seems to always want more memory. Besides, we
do get the Out of Memory error.
Thanks for your help,
Nicolas RiveraHi,
there are two sources of memory leakage in JNI:
- regular leaks in c/c++ code;
- not released local/global references of java objects in JNI.
I think that the first issue in not a problem for you. The second is more complex. In your JNI code you should check
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I guess that is your problem.
Vitally -
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Hi,
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int numVerts=0, numStrips=0;
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if (javaObj==NULL)
return NULL;
cout << "Created!" << endl;
//Entity ID
cout<< "**Setting eid...";
fid=env->GetFieldID(jEntity,"eid","I");
jint eid = (jint)(entity_list)->eid;
env->SetIntField(javaObj, fid, eid);
//env->DeleteLocalRef(eid);
cout << "Done!" << endl;
cout << "Done!" << endl;
cout<< "**Returning jobject...";
return javaObj;
jobjectArray createJArray(JNIEnv* env, UF_DISP_j3d_entity_t** entity_list, int noOfEntities )
UF_DISP_j3d_entity_t* tempVar=NULL;
cout<<"*Creating Jobjectarray...";
jobjectArray jEntityArray = (jobjectArray) env->NewObjectArray(noOfEntities,
env->FindClass("Lcom/wipro/java3d/rmi/Entity;"),NULL);
cout<<"Created!"<<endl;
for(int i=0; i<noOfEntities;++i)
tempVar = &(*entity_list);
if (tempVar !=NULL)
cout<<"*Trying to get Entity...."<<endl;
jobject jEntity = GetUGEntity(env, tempVar);
if (jEntity!= NULL)
cout<<"Got Entity!" <<endl;
cout <<"*Setting Array Element....";
env->SetObjectArrayElement(jEntityArray, i, jEntity);
cout << "Done!" << endl;
else
printf("ERROR: Did not get Entity Reference");
else
printf("ERROR: Got a NULL Reference!");
return jEntityArray;Hi Deepak,
Could you please let us know upto which line your code is going safe. Try printing the value in the structure before you send that to the method GetUGEntity().
I am not too sure that would be a problem. But I have faced a problem like this, wherein I tried to access a structure for which I have not allocated memory and hence got exception because of that.
Since your JNI code seems to be error free, I got doubt on your C part. Sorry.
Dhamo. -
How can i call a VB6 project from my java application using JNI
hi
can anyone tell me the procedure of calling a VB6 project from any java application using JNI
if anyone does know then tell me the detail procedure of doing that. I know that i have to create a dll of that VB6 project then to call it from the java application.
if anyone know that procedure of creating dll file of an existing VB6 project please reply
please if anyone know then let me knowAhh, kind of a duplicate thread:
http://forums.java.sun.com/thread.jspa?threadID=631642
@OP. You could have clarified your original post and the relationship of your question to java. You did not need a new thread.
� {� -
Java mapping of application triggered an exception
Hi,
We have ascenario where a vendor will be sending us a cXML file which has the second line as <!DOCTYPE cXML SYSTEM "http://xml.cxml.org/schemas/cXML/1.2.009/InvoiceDetail.dtd">. If I open it in XMLSpy, it is saying the file as invalid. XI is unable to map this file. So we decided to remove that line using Java mapping and then do the regular graphical mapping.
I took the java code from the SAP note 812966 and used the aii_map_api.jar, dom.jar, jaxp-api.jar to create the class of that java file and used that class file by importing that into XI as a jar file.
I'm getting this error in the request message mapping of SXMB_MONI
<SAP:Error xmlns:SAP="http://sap.com/xi/XI/Message/30" xmlns:SOAP="http://schemas.xmlsoap.org/soap/envelope/" SOAP:mustUnderstand="">
<SAP:Category>Application</SAP:Category>
<SAP:Code area="MAPPING">STREAM_TRANSFORMATION_EX</SAP:Code>
<SAP:P1>mypackage/DeleteDTDDeclarationWithDOM</SAP:P1>
<SAP:P2>Failed to load resource from the context classloa~</SAP:P2>
<SAP:P3 />
<SAP:P4 />
<SAP:AdditionalText />
<SAP:ApplicationFaultMessage namespace="" />
<SAP:Stack>Java mapping of application triggered an exception</SAP:Stack>
<SAP:Retry>M</SAP:Retry>
</SAP:Error>
I'm new to this java mapping, Can you please provide me some details about what files need to be loaded into the XI along with the class file.
Appreciate you help.
Thanks,
MT.Hi Prateek,
Thanks for your quick reply. Yes I have downloaded the aii_map_api.jar from <SAP_install_dir>/<system_name>/<instance_name>/j2ee/cluster/server<number>/apps/sap.com/com.sap.xi.services/
And also I have compiled my java code using the dom.jar, sax.jar, jaxp-api.jar and aii_map_api.jar.
I took the class file of my javacode and all the class files of the above mentioned jar files and prepared one single jar file, which I imported into XI.
It is not allowing me to make a single jar of the actual class file and all the supporting jar files.
What is the actual method of doing it.
Appreciate all your help. Thanks very much.
Thanks,
Maulik. -
Installed Java update three days ago. Now, can't play yahoo games as it's now blocked by security settings. Already have tried moving Java security to Medium and adding yahoo.games.com (including web address of game) as a "Permissive exception". Also tried removing java and installing older version. Still nothing. Really Apple?!? What's your beef with yahoo games?
csnorth,
all of the older update versions of Java SE 7 can be found here. If 7u45 also didn’t work with your Yahoo! games, you can choose from any of the even older versions there as well. -
Hello all. These days i've been asked to make a little aplication for a PDA and while looking for information about j2me it says jni its not supported. But the app i need to make needs to use some library written in C, and my question is if there is any way o making an application in j2me that can use those libraries.
Thanks all.Yes i've found a compiler for my target platform and compiling and running the C libraries doesnt seem a problem at the time. My main problem is that I can't call them from my java application because jni is not supported and i dont know how to import them.
Thanks for your answer
Message was edited by:
trospito -
Java, access database( mdb) and java.sql.date
I having a problem querying my access database with user specified date the code is as follows
//get results of income from database with respectto dates
//so u first create the sql.date instances
private void getResults(){
String text1=from.getText();//text input is like this 01-01-2005
String text2=to.getText();
Date d1=new Date(Integer.parseInt(text1.substring(6)),Integer.parseInt(text1.substring(3,5)),Integer.parseInt(text1.substring(0,2)));
JOptionPane.showMessageDialog(this,d1.toString());//traces date with 1900 added to year and 1 added to month
try{
//custom class DataSource used to connect to database
Connection conn=DataSource.getConnection("RealFotoInc");
PreparedStatement ps=conn.prepareStatement("select * from Members where date=?");
ps.setDate(1,d1);
ResultSet rs=ps.executeQuery();
while(rs.next()){
System.out.println("going");
System.out.println("trial"+rs.getString(3));
}catch(Exception se){
JOptionPane.showMessageDialog(this,se);
}and it prints out nothing I dont know what is wrongWhoever put that comment in there about "1900" and so on knew what had to be done. That "Date" class must be "java.sql.Date"; go and read the API documentation of that constructor you are using there. Then adjust the parameters you are passing to it accordingly.
-
Can not locate Java class using JNI within C++ DLL
I am using trying to use JNI to call a Java class from C++. The Java class uses JMS to send messages to a JMS message queue. At first I coded the C++ in a console application that created the JavaVM and used JNI to access the Java class. All worked fine. Then I called the Java class using JNI from threads and ran into the problem of the Java class not able to locate the JMS related classes. This was solved by placing the following line in the constructor of the Java class.
Thread.currentThread().setContextClassLoader(ClassLoader.getSystemClassLoader());
Then I moved the JNI code from a console application to a DLL in specific an extension DLL that is called by SQL Server or Oracle server. The DLL will use JNI to call the Java class and send messages to a JMS message queue.
The problem I am having now when the DLL code is called by SQL Server the call to
JNI_CreateJavaVM
appears to work correctly but the call to find the Java class using
jvmEnv->FindClass(pName)
fails. It appears the is a class loading problem which occurs due to the fact JNI is called from a DLL. When the VM is created I pass the class path information using the statement
-Djava.class.path=
And as I stated before it all works when running from a console application. I am new to JNI and really need help in the form of some sample code that will solve this problem. I believe I need to somehow load the classpath information from the DLL but I can not find examples on how to do this using JNI. I have tried several ways using URLClassLoader and getSystemClassLoader from JNI and either it does not work or it crashes very badly.
I used the following code to determine what the existing class path is and the string returns empty.
jcls = jvmEnv->FindClass("java/lang/System");
jmid = jvmEnv->GetStaticMethodID(jcls, "getProperty", "(Ljava/lang/String;)Ljava/lang/String;");
jstrClassPath = jvmEnv->NewStringUTF("java.class.path");
jstr = (jstring)jvmEnv->CallStaticObjectMethod(jcls, jmid, jstrClassPath);
m_jstr = (jstring)jvmEnv->NewGlobalRef(jstr);
pstr = jvmEnv->GetStringUTFChars(m_jstr, 0);
Can anyone please help with example code that will solve this problem. Thanks in advance for any help.
Charles�I have determined the problem occurs when the application/component is compiled using VC 6.0. The test application was compiled using VC 7.1 and works correctly by locating the class path information. If the test application is compiled using VC 6.0 it has the same problem.
The jvm.dll I am using is version 1.4.2.80. Currently this is not an option to compile all the applications that use JNI using VC 7.1 so can someone please tell me how to solve this problem. -
Java Audio Metronome | Timing and Speed Problems
Hi all,
I’m starting to work on a music/metronome application in Java and I’m running into some problems with the timing and speed.
For testing purposes I’m trying to play two sine wave tones at the same time at regular intervals, but instead they play in sync for a few beats and then slightly out of sync for a few beats and then back in sync again for a few beats.
From researching good metronome programming, I found that Thread.sleep() is horrible for timing, so I completely avoided that and went with checking System.nanoTime() to determine when the sounds should play.
I’m using AudioSystem’s SourceDataLine for my audio player and I’m using a thread for each tone that constantly polls System.nanoTime() in order to determine when the sound should play. I create a new SourceDataLine and delete the previous one each time a sound plays, because the volume fluctuates if I leave the line open and keep playing sounds on the same line. I create the player before polling nanoTime() so that the player is already created and all it has to do is play the sound when it is time.
In theory this seemed like a good method for getting each sound to play on time, but it’s not working correctly.
At the moment this is just a simple test in Java, but my goal is to create my app on mobile devices (Android, iOS, Windows Phone, etc)...however my current method isn’t even keeping perfect time on a PC, so I’m worried that certain mobile devices with limited resources will have even more timing problems. I will also be adding more sounds to it to create more complex rhythms, so it needs to be able to handle multiple sounds going simultaneously without sounds lagging.
Another problem I’m having is that the max tempo is controlled by the length of the tone since the tones don’t overlap each other. I tried adding additional threads so that every tone that played would get its own thread...but that really screwed up the timing, so I took it out. I would like to have a way to overlap the previous sound to allow for much higher tempos.
I posted this question on StackOverflow where I got one reply and my response back explains why I went this direction instead of preloading a larger buffer (which is what they recommended). In short, I did try the buffer method first, but I want to also update a “beat counter” visual display and there was no way to know when the hardware was actually playing the sounds from the buffer. I mentioned that on StackOverflow and I also asked a couple more questions regarding the buffer method, but I haven’t received any more responses.
http://stackoverflow.com/questions/24110247/java-audio-metronome-timing-and-speed-problems
Any help getting these timing and speed issues straightened out would be greatly appreciated! Thanks.
Here is my code...
SoundTest.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.io.*;
import javax.sound.sampled.*;
public class SoundTest implements ActionListener {
static SoundTest soundTest;
// ENABLE/DISABLE SOUNDS
boolean playSound1 = true;
boolean playSound2 = true;
JFrame mainFrame;
JPanel mainContent;
JPanel center;
JButton buttonPlay;
int sampleRate = 44100;
long startTime;
SourceDataLine line = null;
int tickLength;
boolean playing = false;
SoundElement sound01;
SoundElement sound02;
public static void main (String[] args) {
soundTest = new SoundTest();
SwingUtilities.invokeLater(new Runnable() { public void run() {
soundTest.gui_CreateAndShow();
public void gui_CreateAndShow() {
gui_FrameAndContentPanel();
gui_AddContent();
public void gui_FrameAndContentPanel() {
mainContent = new JPanel();
mainContent.setLayout(new BorderLayout());
mainContent.setPreferredSize(new Dimension(500,500));
mainContent.setOpaque(true);
mainFrame = new JFrame("Sound Test");
mainFrame.setContentPane(mainContent);
mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
mainFrame.pack();
mainFrame.setVisible(true);
public void gui_AddContent() {
JPanel center = new JPanel();
center.setOpaque(true);
buttonPlay = new JButton("PLAY / STOP");
buttonPlay.setActionCommand("play");
buttonPlay.addActionListener(this);
buttonPlay.setPreferredSize(new Dimension(200, 50));
center.add(buttonPlay);
mainContent.add(center, BorderLayout.CENTER);
public void actionPerformed(ActionEvent e) {
if (!playing) {
playing = true;
if (playSound1)
sound01 = new SoundElement(this, "Sound1", 800, 1);
if (playSound2)
sound02 = new SoundElement(this, "Sound2", 1200, 1);
startTime = System.nanoTime();
if (playSound1)
new Thread(sound01).start();
if (playSound2)
new Thread(sound02).start();
else {
playing = false;
SoundElement.java
import java.io.*;
import javax.sound.sampled.*;
public class SoundElement implements Runnable {
SoundTest soundTest;
// TEMPO CHANGE
// 750000000=80bpm | 300000000=200bpm | 200000000=300bpm
long nsDelay = 750000000;
long before;
long after;
long diff;
String name="";
int clickLength = 4100;
byte[] audioFile;
double clickFrequency;
double subdivision;
SourceDataLine line = null;
long audioFilePlay;
public SoundElement(SoundTest soundTestIn, String nameIn, double clickFrequencyIn, double subdivisionIn){
soundTest = soundTestIn;
name = nameIn;
clickFrequency = clickFrequencyIn;
subdivision = subdivisionIn;
generateAudioFile();
public void generateAudioFile(){
audioFile = new byte[clickLength * 2];
double temp;
short maxSample;
int p=0;
for (int i = 0; i < audioFile.length;){
temp = Math.sin(2 * Math.PI * p++ / (soundTest.sampleRate/clickFrequency));
maxSample = (short) (temp * Short.MAX_VALUE);
audioFile[i++] = (byte) (maxSample & 0x00ff);
audioFile[i++] = (byte) ((maxSample & 0xff00) >>> 8);
public void run() {
createPlayer();
audioFilePlay = soundTest.startTime + nsDelay;
while (soundTest.playing){
if (System.nanoTime() >= audioFilePlay){
play();
destroyPlayer();
createPlayer();
audioFilePlay += nsDelay;
try { destroyPlayer(); } catch (Exception e) { }
public void createPlayer(){
AudioFormat af = new AudioFormat(soundTest.sampleRate, 16, 1, true, false);
try {
line = AudioSystem.getSourceDataLine(af);
line.open(af);
line.start();
catch (Exception ex) { ex.printStackTrace(); }
public void play(){
line.write(audioFile, 0, audioFile.length);
public void destroyPlayer(){
line.drain();
line.close();Thanks but you have never posted reply s0lutions before ?? And F 4 is definitely not 10 times faster as stated before I upgraded !!
-
Hi,
I am creating a Java app using JNI to call C++ libraries a vendor has provided for us. I used a pointer upon instantiation of the C++ object, store it in the Java side, and when I need to call a method in C, would de-reference that pointer to make function call.
This works well in a standalone Java application. However, when I use a thread to call this object, or a servlet, it will get as far as letting me make one function call in C, but other calls afterwards will cause a core dump.
Anyone experience this before? Please share any insight you might have. Thanks in advance.
-Justin
Here's the code:
=======================================
#include <jni.h>
#include <iostream.h>
#include "com_jni_JNIDSM_0005fServer.h"
#include "DSMC_Server.h"
//Java side: public static int cObjectID
static jobject cls = 0;
static jfieldID fid;
* Class: JNIDSM_0005fServer
* Method: DSM_Server
* Signature: ()I
* Create an instance of this object and return a reference handler (pointer).
* REQUIRED: Need to call this method first before DSM_Server object can be used.
JNIEXPORT jint JNICALL Java_com_jni_JNIDSM_1Server_DSM_1Server
(JNIEnv* p_env, jobject p_obj)
DSMC_Server* server;
server = new DSMC_Server();
cout << "ServerPtr Created = " << (jint)server << endl;
Java_com_jni_JNIDSM_1Server_setCID(p_env, p_obj, (jint) server);
return ((jint) server);
* Class: JNIDSM_0005fServer
* Method: connect
* Signature: (Ljava/lang/String;ILjava/lang/String;I)I
* Create connection from the DSM Client to the Server. Pass in host & port of Server and
* name assigned to the module of the DSM Client.
JNIEXPORT jint JNICALL Java_com_jni_JNIDSM_1Server_connect
(JNIEnv* p_env, jobject p_obj, jstring p_host, jint p_port, jstring p_serverModuleName)
// Obtain pointer reference to corresponding DSM objects
DSMC_Server* serverPtr = (DSMC_Server*)
Java_com_jni_JNIDSM_1Server_getCID (p_env, p_obj);
// Convert the Java String to a Char pointer for use
cout << "ServerPtr in JNI_connect() begin = " << (jint) serverPtr << endl;
jboolean isModCopy, isHostCopy;
const char* host = p_env->GetStringUTFChars(p_host, &isHostCopy);
const char* serverModuleName = p_env->GetStringUTFChars(p_serverModuleName, &isModCopy);
// Call the DSM_Server object's Connect() function
jint status = (*serverPtr).Connect (host, p_port, serverModuleName);
// Clean up object allocation for string copy after method is done
if (isHostCopy == JNI_TRUE)
p_env->ReleaseStringUTFChars(p_host, host);
if (isModCopy == JNI_TRUE)
p_env->ReleaseStringUTFChars(p_serverModuleName, serverModuleName);
cout << "ServerPtr in JNI_connect() after = " << (jint) serverPtr << endl;
return status;
* Class: JNIDSM_0005fServer
* Method: disconnect
* Signature: (I)V
* Disconnect from the Server.
JNIEXPORT void JNICALL Java_com_jni_JNIDSM_1Server_disconnect
(JNIEnv* p_env, jobject p_obj)
// Obtain pointer reference to corresponding DSM objects
DSMC_Server* serverPtr = (DSMC_Server*)
Java_com_jni_JNIDSM_1Server_getCID (p_env, p_obj);
cout << "ServerPtr in disconnect = " << (jint) serverPtr << endl;
// Call the DSM_Server object's Disconnect() function
(*serverPtr).Disconnect();
* Class: JNIDSM_0005fServer
* Method: doHeartbeat
* Signature: (I)I
* Check the status of the Server. Return status code that tells the caller Server' status.
JNIEXPORT jint JNICALL Java_com_jni_JNIDSM_1Server_doHeartbeat
(JNIEnv* p_env, jobject p_obj, jint p_serverPtr)
// Obtain pointer reference to corresponding DSM objects
DSMC_Server* serverPtr = (DSMC_Server*)
Java_com_jni_JNIDSM_1Server_getCID (p_env, p_obj);
// Call the DSM_Server object's DoHeartbeat() function
jint status = (*serverPtr).DoHeartbeat();
return status;
* Class: JNIDSM_0005fServer
* Method: getMaxPacketSize
* Signature: (I)I
* Return the packet size that are being sent through this network connection.
JNIEXPORT jint JNICALL Java_com_jni_JNIDSM_1Server_getMaxPacketSize
(JNIEnv* p_env, jclass p_class)
// Obtain pointer reference to corresponding DSM objects
DSMC_Server* serverPtr = (DSMC_Server*)
Java_com_jni_JNIDSM_1Server_getCID (p_env, p_obj);
// Call the DSM_Server object's GetMaxPacketSize() function
jint packetSize = (*serverPtr).GetMaxPacketSize();
return packetSize;
* Class: com_jni_JNIDSM_0005fServer
* Method: getCID
* Signature: ()J
JNIEXPORT jlong JNICALL Java_com_jni_JNIDSM_1Server_getCID
(JNIEnv* p_env, jobject p_obj)
jclass clazz;
clazz = p_env->GetObjectClass(cls);
fid = p_env->GetStaticFieldID(clazz, "cObjectID", "J");
jint id = p_env->GetStaticLongField(clazz, fid);
cout << "ServerPtr retrieved w/ getCID = " << id << endl;
return id;
* Class: com_jni_JNIDSM_0005fServer
* Method: setCID
* Signature: (J)V
JNIEXPORT void JNICALL Java_com_jni_JNIDSM_1Server_setCID
(JNIEnv* p_env, jobject p_obj, jint p_hndlr)
jclass clazz;
//create global reference
if (cls == 0) {
clazz = p_env->GetObjectClass(p_obj);
if (clazz == 0) {
cout << "Error occurred while getting class ref..."<< endl;
cls = p_env->NewGlobalRef(p_obj);
if (cls == 0) {
cout << "Error occurred trying to create Global ref..."<< endl;
fid = p_env->GetStaticFieldID(clazz, "cObjectID", "J");
} else
clazz = p_env->GetObjectClass(cls);
p_env->SetStaticLongField(clazz, fid, p_hndlr);
cout << "ServerPtr saved in setCID = " << p_hndlr << endl;
}Thanks Tom for your help.
After further debugging and trying new ideas, it turns out to be something really weird within the actual C++ object. I did a very basic execution to just connect and disconnect from the server all within one function. Even with one function call, it would crash. I'm going back to the vendor to let them figure it out.
I've done my own examples of allocating dynamic arrays, setting & getting values, then deallocating it. There were no problems with threads then.
I know I'm not going wacky, hopefully not, but who knows. Thanks again.
Here's the simple code that crashed within a Java thread:
void SomeJNIFunction(<params>) {
jboolean isModCopy, isHostCopy, isAppCopy;
const char* host = p_env->GetStringUTFChars(p_sHost, &isHostCopy);
const char* sModuleName = p_env->GetStringUTFChars(p_sModName, &isModCopy);
const char* sAppName = p_env->GetStringUTFChars(p_sAppName, &isAppCopy);
jint status = 0;
DSMC_Server serverPtr;
DSMC_Event eventPtr;
cout << "In JNI, ready to connect. Host=" << host << "|ModName=" << sModuleName
<< "|AppName=" << sAppName << endl;
// connection attempt
status = serverPtr.Connect (host, p_iPort, sModuleName);
cout << "(JNI) Connected ..." << endl;
//*************crash!!!!!!!********
serverPtr.Disconnect();
} -
Compile and Runtime Exceptions
Hi all,
What are Compile-time Exceptions and Runtime Exceptions.
and by the way,
What are Checked Exceptions and Unchecked Exceptions
Thanks in advancehttp://java.sun.com/docs/books/tutorial/essential/exceptions/index.html
There isn't really such a thing as a "compile time excepitons." "Exceptions" are when something goes wrong at runtime. You can, of course, get compilation errors because your code doesn't follow Java's syntactical rules, but we don't call those exceptions.
And of course, if your compiler is written in Java, then compile time for you is runtime for the compiler. (The compiler is a Java program that's running.) So it could throw an exception. But that's not your code.
Maybe you are looking for
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hi all, happy belated dusshera to all, check the code . i have problem that i am not getting offsetting item after clicking my 2nd radio button. by clicking on this i am getting datathat is aslo reqired but alon with it i should get offsetting item d
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How can I filter data by row contents? Similar to Excel's filter feature.
I would like to view only the rows in which the data in column x is some particular value. For instance, I'd like to view (and create a group of channels) containing only data from rows where the text in column 2 is MC1. ... guess I can't put a pictu
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Hi, I´m using the JMS adapter as a Sender and want to know how the connection to the MQ is done. If i.ex. the external MQ is shut down for maintenance - how does the the JMS adapter in SAP XI reconnect when the MQ is up again? Do we need to deactivat
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How do Firefox 28 and Internet Explorer 11 features compare against each other?
I need a head-to-head comparison of these two browsers. Firefox 26 and IE 9 would be acceptable as well, if the first two have not been out long enough to get a comparison history.
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No songs now in i-tunes library but all still on i pod
help dont know what has happened cant play any songs on i tunes, all still on i pod. on i tunes still has song names but most with ! beside it. i cant locate these songs as they are empty. any help or suggestions would be appreciated thansk pter