java-7

Support for Compressed Strings being Dropped in HotSpot JVM?

由 牧云@^-^@ 提交于 2019-11-27 03:02:49
On this Oracle page Java HotSpot VM Options , it lists -XX:+UseCompressedStrings as being available and on by default. However in Java 6 update 29, it is off by default and in Java 7 update 2 it reports a warning Java HotSpot(TM) 64-Bit Server VM warning: ignoring option UseCompressedStrings; support was removed in 7.0 Does anyone know the thinking behind removing this option? sorting lines of an enormous file.txt in java With -mx2g , this example took 4.541 seconds with the option on and 5.206 second with it off in Java 6 update 29. It is hard to see that it impacts performance. Note: Java 7

How Numeric literal with underscore works in java and why it was added as part of jdk 1.7 [duplicate]

由 馋奶兔 提交于 2019-11-27 03:01:06
问题 This question already has answers here : Java 7 underscore in numeric literals (8 answers) Wierd Syntax - Underscores between digits [duplicate] (1 answer) Closed 6 years ago . Can somebody please explain to me why this feature was added in JDK 7 and how it works? While going through the new features of JDK 7, I found following code. int i; //Java 7 allows underscore in integer i=3455_11_11; 回答1: This is used to group the digits in your numeric (say for example for credit card etc) From

Why did PropertyDescriptor behavior change from Java 1.6 to 1.7?

由 浪尽此生 提交于 2019-11-27 02:45:10
问题 Update: Oracle has confirmed this as a bug. Summary: Certain custom BeanInfo s and PropertyDescriptor s that work in JDK 1.6 fail in JDK 1.7, and some only fail after Garbage Collection has run and cleared certain SoftReferences. Edit: This will also break the ExtendedBeanInfo in Spring 3.1 as noted at the bottom of the post. Edit: If you invoke sections 7.1 or 8.3 of the JavaBeans spec, explain exactly where those parts of the spec require anything. The language is not imperative or

Generic class compiles in Java 6, but not Java 7

由 佐手、 提交于 2019-11-27 02:09:34
问题 I have an interface in Java 6 that compiles correctly: public interface IMultiMap<K, V> extends Map<K, Set<V>> { public int valueSize(); public boolean put(K key, V value); public void clear(Object key); public boolean isEmpty(Object key); } But in Java 7, this interface doesn't compile. I get a compile error on boolean put(K, V) that it has the same erasure as V put(K, V) . The full error from the compiler: error: name clash: put(K#1,V#1) in IMultiMap and put(K#2,V#2) in Map have the same

How do I rename (not move) a file in JDK7?

由 会有一股神秘感。 提交于 2019-11-27 02:07:44
问题 I'm a bit confused with all these new File I/O classes in JDK7. Let's say, I have a Path and want to rename the file it represents. How do I specify the new name, when again a Path is expected? Path p = /* path to /home/me/file123 */; Path name = p.getName(); /* gives me file123 */ name.moveTo(/* what now? */); /* how to rename file123 to file456? */ NOTE: Why do I need JDK7 ? Handling of symbolic links ! Problem is: I have to do it with files whose names and locations are known at runtime.

Does Android plan to support Java7? [closed]

由 守給你的承諾、 提交于 2019-11-27 02:02:29
问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 6 years ago . As Android does not currently support java7, I find myself wondering if they have made an official comment if they are working on supporting it? 回答1: I was under the impresssion that android didn't use oracle java, it uses a subset of apaches harmony java: http://en.wikipedia.org/wiki/Apache_Harmony#Use_in

Tomcat6 and Java 7

由 我怕爱的太早我们不能终老 提交于 2019-11-27 01:57:43
问题 In linux, is it possible to have a web application written using Java 7 be deployed on tomcat6? If so, what configuration needs to be modified to allow it to work? I have tried changing the JAVA_HOME variable in the tomcat6.conf file and restarting, but it is still using 1.6 according to the tomcat manager webpage, and only applications written in 1.6 or lower deploy correctly. I have both jdk 1.6 and 1.7 installed in different locations. 回答1: I had a major problem when I compiled my servlet

Error occurred during initialization of VM (java/lang/NoClassDefFoundError: java/lang/Object)

由 穿精又带淫゛_ 提交于 2019-11-27 01:16:35
问题 I'm trying to install Java to use Eclipse (I followed all instructions to install Java and Eclipse) but my Eclipse is not starting due to some bad configuration I guess. I can't figure out why it's not working for me. Eclipse Installation: Extracted Eclipse at C:\eclipse Created a shortcut to my desktop having target C:\eclipse\eclipse.exe When I try to run Eclipse with this shortcut, I see following Eclipse splash screen for a second and it disappears. Eclipse does not start at all. JAVA

Enable TLSv1.2 and TLS_RSA_WITH_AES_256_CBC_SHA256 Cipher Suite

由 妖精的绣舞 提交于 2019-11-27 01:07:18
问题 Server: TLS Version: v1.2 Cipher Suite: TLS_RSA_WITH_AES_256_CBC_SHA256 Client: JRE 1.7 I am receiving the below error when I try to connect to the Server from Client through SSL directly: Caused by: javax.net.ssl.SSLHandshakeException: Received fatal alert: handshake_failure at sun.security.ssl.Alerts.getSSLException(Alerts.java:192) at sun.security.ssl.Alerts.getSSLException(Alerts.java:154) The below code enables TLSv1.2 Set<String> enabledTLSSet = new HashSet<String>(Arrays.asList

Android Studio 'tools.jar' file is not present in classpath

由 ε祈祈猫儿з 提交于 2019-11-27 00:00:27
问题 I downloaded the current version of Android Studio (latest as of 4th July 2013) I also downloaded the JDK version 7u25. However, it displays error after startup: Please ensure JAVA_HOME points to JDK rather than JRE. I don't know how to solve this problem, which won't let me run the IDE. I would appreciate any help. 回答1: Check if java JDK is installed correctly dpkg --list | grep -i jdk if not install JDK sudo add-apt-repository ppa:webupd8team/java sudo apt-get update && sudo apt-get install
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