Failed adding to JNI local ref table (has 512 entries) about javacpp

[saudet]

A call to JavaCPP_detach(attached) is missing at the end... Could you try again with the latest version of JavaCPP to see if the same thing happens? And if so, could you also provide the FunctionPointer declaration? Thanks!

I've tried with the latest version (0.10) and I'm getting the same result.

This is the FunctionPointer declaration:

public @Name("LocalizedCaseInsensitiveCompare") int call(@Cast("const char *") String str1,@Cast("const char *") String str2, int charsToCompare)

And this is the full method (using the latest version 0.10)

int JavaCPP_com_mypackage_MyClass_00024LocalizedCaseInsensitiveCompareCallback::operator()(const char * arg0, const char * arg1, int arg2) {
    jint rarg = 0;
    jthrowable exc = NULL;
    JNIEnv* env;
    bool attached = JavaCPP_getEnv(&env);
    if (env == NULL) {
        goto end;
    }
{
    jvalue args[3];
    jstring obj0 = (const char*)arg0 == NULL ? NULL : env->NewStringUTF((const char*)arg0);
    args[0].l = obj0;
    jstring obj1 = (const char*)arg1 == NULL ? NULL : env->NewStringUTF((const char*)arg1);
    args[1].l = obj1;
    args[2].i = (jint)arg2;
    if (obj == NULL) {
        obj = env->NewGlobalRef(JavaCPP_createPointer(env, 70));
        if (obj == NULL) {
            JavaCPP_log("Error creating global reference of com_mypackage_MyClass.LocalizedCaseInsensitiveCompareCallback instance for callback.");
        } else {
            env->SetLongField(obj, JavaCPP_addressFID, ptr_to_jlong(this));
        }
        ptr = &LocalizedCaseInsensitiveCompare;
    }
    if (mid == NULL) {
        mid = JavaCPP_getMethodID(env, 70, "call", "(Ljava/lang/String;Ljava/lang/String;I)I");
    }
    if (env->IsSameObject(obj, NULL)) {
        JavaCPP_log("Function pointer object is NULL in callback for com_mypackage_MyClass.LocalizedCaseInsensitiveCompareCallback.");
    } else if (mid == NULL) {
        JavaCPP_log("Error getting method ID of function caller \"public int com_mypackage_MyClass$LocalizedCaseInsensitiveCompareCallback.call(java.lang.String,java.lang.String,int)\" for callback.");
    } else {
        rarg = env->CallIntMethodA(obj, mid, args);
        if ((exc = env->ExceptionOccurred()) != NULL) {
            env->ExceptionClear();
        }
    }
    env->DeleteLocalRef(obj0);
    env->DeleteLocalRef(obj1);
}
end:
    if (exc != NULL) {
        jstring str = (jstring)env->CallObjectMethod(exc, JavaCPP_toStringMID);
        env->DeleteLocalRef(exc);
        const char *msg = env->GetStringUTFChars(str, NULL);
        JavaCPP_exception e(msg);
        env->ReleaseStringUTFChars(str, msg);
        env->DeleteLocalRef(str);
        JavaCPP_detach(attached);
        throw e;
    } else {
        JavaCPP_detach(attached);
    }
    return rarg;
}

[saudet]

On my machine, with the following files:

Foo.java

import org.bytedeco.javacpp.*;
import org.bytedeco.javacpp.annotation.*;

public class Foo {
    public static class Callback extends FunctionPointer {
        public @Name("foo") int call(String a, String b, int n) throws Exception { 
            return n;
        }
    }
}

foo.cpp

#include <iostream>
#include "jniFoo.h"

int main() {
    JavaCPP_init(0, NULL);
    for (int i = 0; i < 1000000; i++) {
        foo("foo", "bar", 42);
    }
    JavaCPP_uninit();
}

And the following commands:

$ javac -cp javacpp.jar Foo.java
$ java -jar javacpp.jar Foo -header
$ g++ -I/usr/lib/jvm/java/include/ -I/usr/lib/jvm/java/include/linux/ linux-x86_64/libjniFoo.so foo.cpp -o foo
$ ./foo

Nothing bad happens. Could you please tell me what results you get with that on your machine?

[spotell]

I create Foo.java and foo.cpp and add build 10 javacpp.jar to the directory.

javac -cp javacpp.jar Foo.java works fine and creates Foo$Callback.class and Foo.class

java -jar javacpp.jar Foo -header causes this error:

Generating C:\Acronis\temp\jniFoo.cpp
Compiling C:\Acronis\temp\windows-x86\jniFoo.dll
cl "/IC:\Program Files (x86)\Java\jdk1.7.0_65\include" "/IC:\Program Files (x86)\Java\jdk1.7.0_65\include\win32" C:\Acronis\temp\jniFoo.cpp /W3 /Oi /O2 /EHsc /Gy /GL
/MD /LD /link /OUT:C:\Acronis\temp\windows-x86\jniFoo.dll "/LIBPATH:C:\Program Files (x86)\Java\jdk1.7.0_65\lib" "/LIBPATH:C:\Program Files (x86)\Java\jdk1.7.0_65\jre
\bin\server" jvm.lib
Exception in thread "main" java.io.IOException: Cannot run program "cl": CreateProcess error=2, The system cannot find the file specified
at java.lang.ProcessBuilder.start(ProcessBuilder.java:1047)
at org.bytedeco.javacpp.tools.Builder.compile(Builder.java:302)
at org.bytedeco.javacpp.tools.Builder.generateAndCompile(Builder.java:356)
at org.bytedeco.javacpp.tools.Builder.build(Builder.java:627)
at org.bytedeco.javacpp.tools.Builder.main(Builder.java:760)
Caused by: java.io.IOException: CreateProcess error=2, The system cannot find the file specified
at java.lang.ProcessImpl.create(Native Method)
at java.lang.ProcessImpl.(ProcessImpl.java:385)
at java.lang.ProcessImpl.start(ProcessImpl.java:136)
at java.lang.ProcessBuilder.start(ProcessBuilder.java:1028)
... 4 more

[saudet]

How are you building for the class that contains your FunctionPointer declaration?

[spotell]

Is there another instruction for building that class?

[saudet]

@spotell Could you provide more details about what you are trying to accomplish?

[spotell]

I am getting the same error as lalosoft so was following your instructions for building Foo.java and foo.cpp. You do not get an error and I do when executing your commands in order.

[saudet]

You're on Windows, so you're going to need to install a C++ compiler separately to try this out:
https://github.com/bytedeco/javacpp#required-software

[saudet]

Given the lack of feedback, I'm guessing this issue has been resolved, but please let me know if this is not the case! Thank you