java-7

There are known compatibility issues with JDK7 compiled code using instrumentation. As for http://www.oracle.com/technetwork/java/javase/compatibility-417013.html Classfiles with version number 51 are exclusively verified using the type-checking verifier, and thus the methods must have StackMapTable attributes when appropriate. For classfiles with version 50, the Hotspot JVM would (and continues to) failover to the type-inferencing verifier if the stackmaps in the file were missing or incorrect. This failover behavior does not occur for classfiles with version 51 (the default version for Java

I have seen similar questions, but haven't yet found the answer. Using maven compile, I get: [ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.0:compile (default-compile) on project api: Fatal error compiling: invalid target release: 1.7 -> [Help 1] Here is the pom.xml: <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.0</version> <configuration> <source>1.7</source> <target>1.7</target> <encoding>UTF-8</encoding> </configuration> </plugin> Javac version: javac 1.7.0_25 Java version: java version "1.7.0

I've JDK 1.7 installed on my windows 7 machine and after installing JDK 1.8 u20 I'm having following error: C:\>java -version Error: Registry key 'Software\JavaSoft\Java Runtime Environment'\CurrentVersion' has value '1.8', but '1.7' is required. Error: could not find java.dll Error: Could not find Java SE Runtime Environment. My PATH variable points to the older version (i.e. 1.7). What is wrong here and how I could use java 8 along with java 7? Chris The problem is that Java 8 installs a lot of stuff that you don't really need: \windows\system32 contains Java 8 java.exe, javaw.exe and javaws

I've recently come across the java @SafeVarargs annotation. Googling for what makes a variadic function in Java unsafe left me rather confused (heap poisoning? erased types?), so I'd like to know a few things: What makes a variadic Java function unsafe in the @SafeVarargs sense (preferably explained in the form of an in-depth example)? Why is this annotation left to the discretion of the programmer? Isn't this something the compiler should be able to check? Is there some standard one must adhere to in order to ensure his function is indeed varags safe? If not, what are the best practices to

Is Java Concurrency in Practice still valid? I am wondering whether the ideas, concepts and implementation described in the book are still compliant with the latest Java versions. I ask because the latest edition was done in 2006. Yes, it's still valid in my mind. There isn't big change in this area from 6 to 7. Fork-join is a new feature, which is very suitable for divide-and-conquer type of problems. But all the existing stuff inside the book, such as synchronization, volatile, servlet, are still very valid. While my perspective may be biased, my current intention for updating the book would

Here's the example . If you build and run TranslucentWindow in let's say, NetBeans IDE 7.0, which supports jdk7, you'll get the following exception: Exception in thread "AWT-EventQueue-0" java.awt.IllegalComponentStateException: The frame is decorated at java.awt.Frame.setOpacity(Frame.java:960) at main.TranslucentWindow.<init>(TranslucentWindow.java:23) at main.TranslucentWindow$1.run(TranslucentWindow.java:47) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:705) at java.awt.EventQueue.access$000(EventQueue.java:101

This question already has an answer here: how do I get eclipse to use a different compiler version for Java? 4 answers I'm trying to upgrade from jre6 and jdk6 to jre7 and jdk7. I program using eclipse, i downloaded and installed the jre7 and jdk7 on: C:\program files\java\ now when I enter eclipse i want to change the used compiler so i go to: window>preferences>java>compiler but there appears only 1.3,1.4,1.5 and 1.6 I've also entered: window>preferences>java>Installed JREs and added the jre7 version. But the compiler I can't change. how do I change my eclipse compiler? You need to upgrade