java-7

I run my app on production env (rhel 5.2 x64, oracle jre 1.7_05, tomcat 7.0.28) with JVM arguments: -Xms8192m -Xmx8192m -XX:MaxPermSize=1024m -Doracle.net.tns_admin=/var/ora_net -XX:ReservedCodeCacheSize=512m -XX:+AggressiveOpts -XX:+UseFastAccessorMethods -XX:+UseStringCache -XX:+OptimizeStringConcat -XX:+UseCompressedOops -XX:+UseG1GC -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=9026 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false After several time i've got stack trace like that: Java HotSpot(TM) 64-Bit Server VM warning:

I've recently moved to Java 7 in one of my projects. I claim that it can run on Java 1.5 simply because there's nothing I depend on that is in Java 6 or 7. However when compiling today I noticed this: bootstrap class path not set in conjunction with -source 1.5 Google has found little information on this warning. Does this mean that you can't compile to Java 1.5 from Java 1.7? This Oracle blog explains the warning: http://blogs.oracle.com/darcy/entry/bootclasspath_older_source The reason is, that if you fail to set rt.jar for the older platform, then: If the second step is not taken, javac

Here is a simple example of some code that compiles using Java 6, but does not compile in Java 7. public class Test<T extends Test> { private final int _myVar; public Test(int myVar) { _myVar = myVar; } public int get(TestContainer<T> container){ T t = container.get(); return t._myVar; } private static class TestContainer<T extends Test> { private final T _test; private TestContainer(T test) { _test = test; } public T get(){ return _test; } } } In Java 7, it fails to compile in the get(TestContainer<T> container) method, with the error: error: _myVar has private access in Test I don't

How can I get the size of a file or directory using the new NIO in java 7? Use Files.size(Path) to get the size of a file. For the size of a directory (meaning the size of all files contained in it), you still need to recurse manually, as far as I know. Here is a ready to run example that will also skip-and-log directories it can't enter. It uses java.util.concurrent.atomic.AtomicLong to accumulate state. public static void main(String[] args) throws IOException { Path path = Paths.get("c:/"); long size = getSize(path); System.out.println("size=" + size); } static long getSize(Path startPath)

I have been using Java Application Bundler to pack a Java application as .app. I have managed to run the application if I pack the JRE7 inside of the .app bundle. Is it possible to configure .app (in Info.plist) to point to the JRE defined by JAVA_HOME environment variable? If I do that, I am getting "Unable to load Java Runtime Environment"! I have tried to configure the JAVA_HOME in different ways, but with no success! Can anyone provide any help or suggestion? appbundler applications can use either an embedded Java 7 JRE inside the app bundle, or the Java 7 JRE installed in /Library

What complexity are the methods multiply , divide and pow in BigInteger currently? There is no mention of the computational complexity in the documentation (nor anywhere else). If you look at the code for BigInteger (provided with JDK), it appears to me that multiply(..) has O(n^2) (actually the method is multiplyToLen(..) ). The code for the other methods is a bit more complex, but you can see yourself. Note: this is for Java 6. I assume it won't differ in Java 7. There is a new "better" BigInteger class that is not being used by the sun jdk for conservateism and lack of useful regression

The preview release of Java 7 seems to be missing JCE package for unlimited cryptography strength. Has someone stumbled upon such? http://www.oracle.com/technetwork/java/javase/downloads/jce-7-download-432124.html You need to install the missing JCE package. Locate your jre lib/security directory $ which java /usr/bin/java # Do this recursively till you find the java installation folder $ ls -la /usr/bin/java On Linux it should be by default: /usr/lib/jvm/java-6-sun-1.6.0.26/jre/lib/security/ On Windows it should be by default: C:\Program Files\Java\jre7\lib\security Download the Java