Java – Tech.It.2.Me

Java: One-liner check if you have the JCE Unlimited Strength Jurisdiction Policy

In case you installed the the “stronger” Java Crytography Extension, you can check with:

$JAVA_HOME/bin/jrunscript -e 'print (javax.crypto.Cipher.getMaxAllowedKeyLength("RC5") >= 256);'

Java code snippet: Enumeration to return String value

I probably should be adding this kind of stuff on GitHub, but I’m lazy. 🙂


public enum TokenType {

    TICKET("ticket"),
    UNKNOWN("unknown");

    private String tokenType;

    TokenType(String tokenType) {
        this.tokenType = tokenType;
    }

    public String getTokenType() {
        return tokenType;
    }

    public boolean isTicket() {
        return this == TICKET;
    }

    public boolean isValidType() {
        return this == TICKET;
    }

    public static TokenType getByTokenType(String tokenType) {
        String safeTokenType = (tokenType != null) ? tokenType.toLowerCase().trim() : "";

        for (TokenType tt : values()) {
            if (tt.getTokenType().equals(safeTokenType)) {
                return tt;
            }
        }

        return UNKNOWN;
    }

    public boolean isUnknown() {
        return this == UNKNOWN;
    }
}

Maven error with Java 6 on OS X: “Unsupported major.minor version 51.0”

If you encounter the error below with Java 6 on OS X, make sure you’re using Maven 3.2.5 or older.

$ mvn
Exception in thread "main" java.lang.UnsupportedClassVersionError: org/apache/maven/cli/MavenCli : Unsupported major.minor version 51.0
  at java.lang.ClassLoader.defineClass1(Native Method)
  at java.lang.ClassLoader.defineClassCond(ClassLoader.java:637)
  at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
  at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
  at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
  at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
  at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
  at java.security.AccessController.doPrivileged(Native Method)
  at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
  at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClassFromSelf(ClassRealm.java:401)
  at org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy.loadClass(SelfFirstStrategy.java:42)
  at org.codehaus.plexus.classworlds.realm.ClassRealm.unsynchronizedLoadClass(ClassRealm.java:271)
  at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:254)
  at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:239)
  at org.codehaus.plexus.classworlds.launcher.Launcher.getMainClass(Launcher.java:144)
  at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:266)
  at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
  at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
  at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)

Seven wastes of software development

Perfect for analyzing why a ticket you worked on longer than expected, which usually always does! Check it out here!

Quickly, though, they are:

Partially Done Work
Extra Features
Relearning
Handoffs
Delays
Task Switching
Defects

Seven performance metrics for Java applications

I came across this in this blog post and am adding it here as a checklist. It’s a worthwhile list to have so you can understand how your Java app behaves in production.

Response times and throughput
Load Average
Error Rates (and how to solve them)
GC rate and pause duration
Business Metrics
Uptime and service health
Log size