naaman

Hot Swapping With Maven, Jetty and IntelliJ

Based on Configuring Jetty, Maven, and Eclipse together with Hot Swap

I've always been a bit jealous when it comes to the Play! framework and the great dev mode they have for hot swapping classes at runtime. Jetty has a configuration setting, scanIntervalSeconds, that mimics this when working with a more traditional WAR, but does so by looking for changes to a file and restarting the server.

Fortunately, Jetty also provides the ability to rapidly test code with hot swapping. No more server restarts. The trick to getting hot swapping to work is to attach a remote debugger to your Jetty process. The following instructions outline how to do this in IntelliJ (tested with IDEA 10.5 CE).

Modify your jetty-maven-plugin to ignore the scan interval

1. Open your pom and locate the plugins section

naaman

#!/usr/bin/env bash
mkdir vim
curl https://s3.amazonaws.com/heroku-vim/vim-7.3.tar.gz --location --silent | tar xz -C vim
export PATH=$PATH:/app/vim/bin

naaman

for app in $(heroku apps); do heroku apps:destroy --app $app --confirm $app; done

naaman

pane() {
  local currentDir=$(pwd)
  osascript <<EOD 
tell application "iTerm"
  tell application "System Events" to keystroke "d" using command down
  tell current session of current terminal
    write text "cd $currentDir"
    write text "$@"
  end tell
end tell

naaman

$ cd $ICEDTEA_PATH
$ find . -name NetworkInterface.c
./openjdk/jdk/src/solaris/native/java/net/NetworkInterface.c
...
$ cp ./openjdk/jdk/src/solaris/native/java/net/NetworkInterface.c ./NetworkInterface.c
$ vi NetworkInterface.c
  /fscanf
    note: fscanf should only match one line
    replace first 02x with 08x
  :wq

naaman

--- ./openjdk/jdk/src/solaris/native/java/net/NetworkInterface.c	2013-03-04 21:51:01.000000000 +0000
+++ ./openjdk/jdk/src/solaris/native/java/net/NetworkInterface.c	2013-04-02 22:35:56.000000000 +0000
@@ -1127,7 +1127,7 @@
     uint8_t ipv6addr[16];
 
     if ((f = fopen(_PATH_PROCNET_IFINET6, "r")) != NULL) {
-        while (fscanf(f, "%4s%4s%4s%4s%4s%4s%4s%4s %02x %02x %02x %02x %20s\n",
+        while (fscanf(f, "%4s%4s%4s%4s%4s%4s%4s%4s %08x %02x %02x %02x %20s\n",
                          addr6p[0], addr6p[1], addr6p[2], addr6p[3], addr6p[4], addr6p[5], addr6p[6], addr6p[7],
                          &if_idx, &plen, &scope, &dad_status, devname) != EOF) {

naaman

java -version 2>&1 | head -1 | sed "s/[^0-9\.\_\-]*//g"

naaman

// hack to get a Stream with a cursor-backed query because anorm doesn't combine the two
private def resultSetToStream(sql: SimpleSql[Row])(implicit c: Connection): Stream[SqlRow] = {
  val stmt = sql.getFilledStatement(c, getGeneratedKeys = false)
  stmt.setFetchSize(1000)
  val rs = stmt.executeQuery()
  val rsMetaData = Sql.metaData(rs)
  val columns = List.range(1, rsMetaData.columnCount + 1)
  def data(rs: java.sql.ResultSet) = columns.map(nb => rs.getObject(nb))
  Useful.unfold(rs)(rs => if (!rs.next()) { rs.getStatement.close(); None } else Some((new SqlRow(rsMetaData, data(rs)), rs)))
}

naaman

    1  ls -lah
    2  curl -O http://icedtea.wildebeest.org/download/source/icedtea-2.1.5.tar.gz
    3  tar xvzf icedtea-2.1.5.tar.gz 
    4  cd icedtea-2.1.5
    5  ./configure --with-parallel-jobs=2 --disable-docs --disable-bootstrap --with-jdk-home=/usr/lib/jvm/java-6-openjdk
    6  cd ..
    7  curl -O http://mirror.olnevhost.net/pub/apache//ant/binaries/apache-ant-1.8.4-bin.tar.gz
    8  tar xf apache-ant-1.8.4-bin.tar.gz 
    9  ls -lah
   10  ls -lah apache-ant-1.8.4

naaman

import java.security.Provider;
import java.security.Security;

public class SecurityListings {
  public static void main(String[] args) {
    for (Provider provider : Security.getProviders()) {
      System.out.println("Provider: " + provider.getName());
      for (Provider.Service service : provider.getServices()) {
        System.out.println("  Algorithm: " + service.getAlgorithm());
      }