pal

package com.palbrattberg.classpathtools;

import java.io.File;
import java.io.FilenameFilter;
import java.io.Serializable;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Enumeration;

pmahoney

Orien is correct, it is the fork() system call triggered by ProcessBuilder or Runtime.exec or other means of the JVM executing an external process (e.g. another JVM running ant, a git command, etc.).

There have been some posts on the Jenkins mailing lists about this: Cannot run program "git" ... error=12, Cannot allocate memory

There is a nice description of the issue on the SCons dev list: fork()+exec() vs posix_spawn()

There is a long standing JVM bug report with solutions: Use posix_spawn, not fork, on S10 to avoid swap exhaustion. But I'm not sure if this actually made it into JDK7 as the comments suggest was the plan.

In summary, on Unix-like systems, when one process (e.g. the JVM) needs to launch another process (e.g. git) a system call is made to

shihpeng

import javax.net.ssl.*;
import java.io.*;
import java.nio.ByteBuffer;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import java.util.zip.Deflater;

/*
 *  This is a simple implementation of the Lumberjack client. 

apangin

_hashCode                               java/lang/Object.hashCode()I
_getClass                               java/lang/Object.getClass()Ljava/lang/Class;
_clone                                  java/lang/Object.clone()Ljava/lang/Object;
_dabs                                   java/lang/Math.abs(D)D
_dsin                                   java/lang/Math.sin(D)D
_dcos                                   java/lang/Math.cos(D)D
_dtan                                   java/lang/Math.tan(D)D
_datan2                                 java/lang/Math.atan2(DD)D
_dsqrt                                  java/lang/Math.sqrt(D)D
_dlog                                   java/lang/Math.log(D)D

jpountz

DELETE test 

PUT test
{
  "mappings": {
    "test": {
      "properties": {
        "start": {
          "type": "date"
        },

apangin

/*
 * Compile: gcc -I $JAVA_HOME/include -I $JAVA_HOME/include/linux -shared -fPIC -O3 -olibrafpatch.so -Wl,-soname,librafpatch.so rafpatch.c $JAVA_HOME/lib/amd64/libjava.so
 * Run:     java -agentpath:/path/to/librafpatch.so MainClass
 */

#include <jvmti.h>
#include <jni.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>

apangin

import java.lang.reflect.Method;
import java.util.Arrays;

public class Bytecodes {

    static {
        System.loadLibrary("bytecodes");
    }

    private static native byte[] getBytecodes(Method method);

reggi

How to setup AWS lambda function to talk to the internet and VPC

I'm going to walk you through the steps for setting up a AWS Lambda to talk to the internet and a VPC. Let's dive in.

So it might be really unintuitive at first but lambda functions have three states.

1. No VPC, where it can talk openly to the web, but can't talk to any of your AWS services.
2. VPC, the default setting where the lambda function can talk to your AWS services but can't talk to the web.
3. VPC with NAT, The best of both worlds, AWS services and web.

ursuad

Kafka Topics

List existing topics

bin/kafka-topics.sh --zookeeper localhost:2181 --list

Describe a topic

bin/kafka-topics.sh --zookeeper localhost:2181 --describe --topic mytopic

Purge a topic

bin/kafka-topics.sh --zookeeper localhost:2181 --alter --topic mytopic --config retention.ms=1000

... wait a minute ...

apangin

import javax.sound.midi.MidiDevice;
import javax.sound.midi.MidiUnavailableException;
import javax.sound.midi.spi.MidiDeviceProvider;

public class HighResolutionTimer {
    private static final MidiDevice midiDevice = getMidiOutDevice();

    private static MidiDevice getMidiOutDevice() {
        MidiDeviceProvider provider = new com.sun.media.sound.MidiOutDeviceProvider();
        MidiDevice.Info[] info = provider.getDeviceInfo();