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Java Forum / General / February 2006JDK and JRE 1.5
It seems jre 1.5 breaks most of my applications built with a previous jdk (1.4 say). Is there an overall reason for this? Something like tools.jar is no longer there or similar or is it some programming reason (to do with generics for example). It seems as bad as MS .NET for breaking stuff. Lucy1 > It seems jre 1.5 breaks most of my applications > built with a previous jdk (1.4 say). Is there an [quoted text clipped - 3 lines] > It seems as bad as MS .NET for breaking stuff. > Lucy1 what exactly are the problems you are experiencing. Just saying it breaks your applications makes it a little difficult to comment on. Atlease I know 1 programmatic change in 1.5 that enum is now keyword in jdk1.5 and if you have used it as variable, that could be a problem.. -Himanshu > It seems jre 1.5 breaks most of my applications > built with a previous jdk (1.4 say). Is there an [quoted text clipped - 3 lines] > It seems as bad as MS .NET for breaking stuff. > Lucy1 Generics cannot break compatibility. The very design of generics in JDK 1.5 ensures that it maintains 100% compatibility with classic code. At the most you might be displayed a warning if you try to recompile your old non-generics enabled code with the 1.5 Java compiler. Please give use some code or quote some error messages about your problem so that we can try to suggest some remedy to your issue. >It seems jre 1.5 breaks most of my applications >built with a previous jdk (1.4 say). Is there an >overall reason for this? Something like tools.jar >is no longer there or similar or is it some programming >reason (to do with generics for example). >It seems as bad as MS .NET for breaking stuff. you mean your code stops working or you just get a lot of generics warning messages?  SignatureCanadian Mind Products, Roedy Green. http://mindprod.com Java custom programming, consulting and coaching. I tried it on our application server, and the jsp pages would not compile (they compile automatically usually) but throw massive errors with jre 1.5. Maybe I am doing sthg silly and its actually OK, but my application server will only work with JSP 1.2, not JSP 2, or...do I simply need the jdk and not the jre? I am using the jre in Program Files/java - its full of automatic jre downloads. I would be so pleased if it did work with 1.5 (at present we use 1.4) Lucy1 > I tried it on our application server, and the jsp pages > would not compile (they compile automatically usually) [quoted text clipped - 6 lines] > I would be so pleased if it did work with 1.5 (at present > we use 1.4) Wait a minute -- what exactly did you try? Did you write JSP pages containing scriptlets that make use of Java 1.5 features, and attempt to compile them on your existing app server? That's bound to fail unless you ensure that your app server is compiling the pages with a Java 1.5 compiler. The JRE does not contain a Java source -> bytecode compiler, which JSP page compilation requires. Any way, we're shooting in the dark. For better-targeted help, post the first few error messages that you receive, and provide as much detail as you can about the environment (application server and version, Java configuration, whatever else may be relevant) and about the code you are using. -- John Bollinger jobollin@indiana.edu I simply changed the jre in the properties file of the app server and it would not compile any jsp page at all. But maybe, it simply cannot find the javac (which is not in the windows jre auto download) I'll do some more tests with a proper jdk 1.5 instead of jre 1.5. > I simply changed the jre in the properties file of the > app server and it would not compile any jsp page > at all. But maybe, it simply cannot find the javac > (which is not in the windows jre auto download) > I'll do some more tests with a proper jdk 1.5 > instead of jre 1.5. Which app server are you using? Tomcat does need a JDK it does *not* work with a JRE Thomas SignatureIt's not a RootKit - it's a Sony I downloaded jdk1.5.0_02 and installed it. Even on a simple java class run its gives the error: Error occurred during initialization of VM java/lang/NoClassDefFoundError: java/lang/Object But JDK 1.5.0 is OK in the tests I have done so far anyway (although I am worried by 4 page not found errors on my App Server - ie servlets not found!) So, either my download of jdk1.5.0_02 was corrupted or there's a fault in it somewhere, (in my opinion). Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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