Java

• Maven

• Profiler

• VM args

  -Duser.timezone=Brazil/East -Dfile.encoding=ISO-8859-1 -Djava.net.preferIPv4Stack=true -Djava.net.preferIPv6Address=false
  

• sched_(get|set)affinity
  
  1) Create ThreadLib.java:

  public class ThreadLib
  {
     ...
     public static native int getAffinity();
     public static native int setAffinity(int mask);
     ...
  }
  

  2) Type:

  javah -jni ThreadLib to create ThreadLib.h
  

  3) Create ThreadLib.c:

  #define _GNU_SOURCE
  #include <jni.h>
  #include <sched.h>
  #include "ThreadLib.h"
  
  JNIEXPORT jint JNICALL Java_ThreadLib_getAffinity(JNIEnv *env, jclass class)
   {
      unsigned long mask;
      unsigned int len = sizeof(mask);
  
      if (sched_getaffinity(0, len, &mask) < 0)
      {
          return -1;
      }
  
      return mask;
   }
  
  JNIEXPORT jint JNICALL Java_ThreadLib_setAffinity(JNIEnv *env, jclass class, jint m)
  {
      unsigned long mask = (unsigned long) m;
      unsigned int len = sizeof(mask);
  
      if (sched_setaffinity(0, len, &mask) < 0)
      {
          return -1;
      }
  
      return m;
  }
  

  4) Compile shared library with:

  gcc -fPIC -shared -I /home/irocha/j2se/include -I /home/irocha/j2se/include/linux/ ThreadLib.c -o libThreadLib.so
  

  5) Set LD_LIBRARY_PATH
  
  6) Execute any java code with:

  int af = ThreadLib.getAffinity();
  System.out.println("Affinity: " + af);
                  
  int ret = ThreadLib.setAffinity(1);
  System.out.println("SetAffinity: " + ret);
  

• Java + MySQL + SSL
  
  1) Create CA certificate:

  openssl genrsa 2048 > ca-key.pem
  openssl req -new -x509 -nodes -days 1000 -key ca-key.pem > ca-cert.pem
  

  2) Create server certificate:

  openssl req -newkey rsa:2048 -days 1000 -nodes -keyout server-key.pem > server-req.pem
  openssl x509 -req -in server-req.pem -days 1000 -CA ca-cert.pem -CAkey ca-key.pem -set_serial 01 > server-cert.pem
  

  3) Create client certificate:

  openssl req -newkey rsa:2048 -days 1000 -nodes -keyout client-key.pem > client-req.pem
  openssl x509 -req -in client-req.pem -days 1000 -CA ca-cert.pem -CAkey ca-key.pem -set_serial 01 > client-cert.pem
  

  4) Hack:

  openssl x509 -outform DER -in client-cert.pem -out client.cert
  

  5) Java Setup:

  keytool -import -alias mysqlServerCACert -file cacert.pem -keystore truststore
  keytool -import -file  client.cert -alias mysqlClientCertificate -keystore keystore
  

  Java Options:

  -Djavax.net.ssl.keyStore=path_to_keystore_file
  -Djavax.net.ssl.keyStorePassword=password
  -Djavax.net.ssl.trustStore=path_to_truststore_file
  -Djavax.net.ssl.trustStorePassword=password 
  

  or

  System.setProperty("javax.net.ssl.keyStore","path_to_keystore_file");
  System.setProperty("javax.net.ssl.keyStorePassword","password");
  System.setProperty("javax.net.ssl.trustStore","path_to_truststore_file");
  System.setProperty("javax.net.ssl.trustStorePassword","password");
  

  Tests:

  openssl genrsa -out key.pem 1024
  openssl rsa -in key.pem -outform DER -out key.der
  openssl rsa -pubout -outform DER -out keyp.der -in key.pem
  openssl base64 -in key.der -out key.pri
  openssl base64 -in keyp.der -out key.pub
  openssl rsautl -inkey key.pem -in test.txt -out test.enc -encrypt
  openssl rsautl -inkey key.pem -in test.enc -out test.txt -decrypt 
  

  and

  openssl enc -aes-256-cbc -in file.txt -out file.enc -iv 0 -K eab9855a666fb697e31ee606dc372a248d29b92528612e6f009f55874bcff6f8
  openssl enc -d -aes-256-cbc -in file.enc -iv 0 -K eab9855a666fb697e31ee606dc372a248d29b92528612e6f009f55874bcff6f8