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I want to migrate my project from IBM websphere 6.1 to oracle weblogic 12c and my project has been developed on Jbuilder, which only supports jdk 1.5. Can I use jdk 1.5 to run it on Weblogic 12c?
No. Java 6 and up according to the support matrix linked to from here the supported platforms are
Oracle JDK 1.6.0_29+
Oracle JDK 1.7.0_02+
IBM JDK 7 (SR1+)
IBM JDK 6 (SR9 FP2 or higher)
Oracle JRockit 6 Update 29 R28.2+
On various platforms. Nothing earlier then 1.6.0_29 is on the list.
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I am currently migrating a project to jdk 10, and since the Java.xml.* have been deprecated, I have used Jakarta ee instead.
Which Jakarta ee version is compatible with Java 10?
Which Jakarta EE version is compatible with Java 10?
I don't know if that is actually an answerable question. Java / Jakarta EE is fundamentally a set of specifications. The specifications do not prescribe a specific Java SE platform or compatibility requirements1.
So what you should really be doing is selecting the EE implementation you intend to use (e.g. Glassfish, JBoss, WebSpere, Weblogic, Wildfly and so on) based on the versions of Java that they require.
Having said that, you should not be targeting Java 10 as an execution platform. It has reached its end of life. You should either target Java 11 (which currently the latest Java LTS release) or the latest non-LTS release. But beware that non-LTS Java releases only have a life time of 6 months.
At this point in time (2 years after its end-of-life) it is likely that most Java EE implementations will no longer (officially) support Java 10 as an execution platform.
1 - Exception: the draft for Jakarta EE 9 requires that the underlying Java platform supports at least Java SE 8.
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I installed netbeans with JAVA EE but i want to use this JAVA EE version with eclipse instead of installing another version for eclipse only.
You can install Apache Tomcat (Servlet Container) or Apache Tomee (JEE support) and then configure Eclipse or Netbeans with them.
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I updated my java VM to v8. But still my command promt shows version is 1.8 and i am unable to run java commands in PC. What is the exact issue ? give me some suggestions to rectify this.....
Java 8 and 1.8 mean the same thing. If java -version reports 1.8.0, then you are using Java 8. So there is no issue: nothing to rectify.
The official word on version numbers and names for Java 8 is in this Oracle document:
Java Platform, Standard Edition 8 Names and Versions.
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I'd like to use some Java8 features in my program. But I should deliver the program within 10 days and seeing that JRE 8 isn't available by oracle worries me. I see that Java8 features have been estabilished and looks to be very stable. My project is in the production camp and not for experiment.
When I search java runtime environment 8 or 1.8 I find nothing published by oracle. Am I making a mistake or I will have to install JDK8 for the client(The worst option). Or I should rewrite all the Java8 codes and make the software compatible with Java7.?
Is there another vendor who has the Java8 ready and if there is, is it wise to use their JRE in spite of the oracle one? Will it remain compatible?
Java 8 is not yet officially released, not from Oracle or any other vendor. There exists pre-release versions, but for a fully supported solution you have to wait until next year. You shouldn't depend on java 8 features yet for production quality code.
Update
Java 8 was fully released on 18 March 2014. It can be downloaded here (jre) or here (jdk).
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I have already JDK 1.6.0.0_25 on my computer with Windows 7 Professional.
How I can savety update current JDK to JDK 7.0 and tesing this update?
I suggest you install JDK 7 as well. You can have Java 6 installed as well and make this this default. You can uninstall one or other version later.
IMO a good way would be to download and install JDK 7 separately. If it works out fine for you, uninstall the previous one and update the environment variables accordingly (namely JAVA_HOME and PATH). You can download the latest stable release here.
Install Java 7. Uninstall Java 6 if it doesn't do that already. If there's an issue with Java 7, uninstall it, reinstall Java 6.
If you're really worried, make a backup. Or try installing it on a VM image of your machine first.