No matter what I try, Eclipse complains about QName not being found... It is indeed on the Classpath. It doesn't cause any other issues, I can compile and run, it just always shows that it can't find it.
Eclipse Java EE IDE for Web Developers.
Version: 2018-09 (4.9.0)
Build id: 20180917-1800
OS: Mac OS X, v.10.14, x86_64 / cocoa
Java version: 11
All I did to make Eclipse to recognize it correctly was move the Java 11 Library up above the Maven Dependencies in Order of imports and Exports... I do not have an explanation as to why this corrected it or even a theory as to why but it works.
Some people who reported similar problems had a module-info.java created.
If you have done that:
either remove it, if you don't need the module system's features
or add a matching requires java.xml; statement to it (assuming you mean javax.xml.namespace.QName). Actually there should be a quickfix that offers to do that, if you use the qualified name in the code and have an error there.
(actually it sounds suspicous that you say you can actually compile and run your code - maybe the errors are just in places that are not used by your test run?
Related
I'm working on updating a large old Java application to Java 17.
It was on Java 11. Note that we build in Eclipse, and all the projects that are part of this application have Java 1.8 compatibility turned on.
Now that I've updated it all to Java 17 (and updated the truckload of .jar files we use to their latest versions as well), I'm getting a problem with a code generator plugin we wrote.
I was able to rebuild the plugin .jar and it seems to be valid. The problem is that when it runs, it fails With this msg:
The method parse(File) from the type DataModelParser refers to the missing type ParserConfigurationException
Since the class definitely exists, I'm assuming it's running into the issue where Java doesn't like being able to find the class in 2 places.
using Ctrl-Shift-T, I find the class available from Java 17 (expected) and "C:\Users\JohnLuss.p2\pool\plugins\javax.xml_1.3.4.v201005080400.jar"
That jar is part of Eclipse - so why does Eclipse have jars that conflict with java 17?
HOW can I make this work? Is there any way to exclude the Eclipse jar?
So I researched a lot about this problem and haven't found anything useful for me yet.
It is mainly about this bug with:
[Java CocoaComponent compatibility mode]: Setting timeout for SWT to 0.100000
Which seems to be related to a bug Eclipse know themselves.
I have tried running Eclipse Indigo, Eclipse 4.2.1 and Eclipse 4.3 with the same result. I tried starting the Eclipse on the second thread as suggested by somewhere "-XStartThreadSecond"<--- something like that, but Eclipse dont recognize that anymore it seems. So maybe someone found a solution to this after so long time?
I am running OSX Mountain Lion, JRE 6, above Eclipse's and I also tried making JRE 7 work in my Eclipse, but the JRE 7 VM dont exist in the folder it should be(I Haven't installed anywhere else).
EDIT:
https://bugs.eclipse.org/bugs/show_bug.cgi?id=212617
http://www.eclipse.org/forums/index.php/m/809088/
I had the same problem when I was using JFreeChart, however none of the solutions worked. Every time I tried to run java application that created a JFrame it crashed on a Mac.
However, I had realized that I have had included all libraries that came with JFreeChart in the Project build path. If you have the same problem, check your library under:
Project -> Properties -> Java Build Path -> Libraries
All you need are: jcommon-1.0.17.jar, and jfreechart-1.014.jar
If you are not using JFreeChart, still check your build path if you are using some conflicting libraries.
Cheers!
I had the same problem using JFreeChart with Eclipse on OSX. It seems adding only jcommon-1.0.17.jar and jfreechart-1.014.jar into your JAR reference path instead of the whole list of libraries is the solution.
Thanks
I've just installed Eclipse, after i installed the java JDK.
The Getting Started guide (in Eclipse) says i should reference my JDK installation in Window>Preferences>Java>Installed JREs, but that a JRE would also work.
Select the Java > Installed JREs preference page to display the installed Java Runtime Environments. Confirm that a JRE has been detected. By default, the JRE used to run the workbench will be used to build and run Java programs. It should appear with a checkmark in the list of installed JREs. We recommend that you use a Java SDK instead of a JRE. An SDK is designed for development and contains the source code for the Java library, easing debugging.
There was already a JRE set up there (not a JDK), so i did nothing and tried to compile a Hello World (just to see what would happen). To my surprise, it compiled!
I searched a little bit and it looks like this works because Eclipse has a built-in Java Compiler. I tried debugging using the same eclipse set up, and it was also successful.
So, what is the difference between setting a JDK and JRE there? Why is it important to download the JDK, since in my default configuration Eclipse doesn't seem to use it?
Probably the main difference is you get the source to all of the Java runtime libraries (with the JDK) which can be a big help. I always use the JDKs for that reason.
Also if you are debugging, this will allow you to meaningfully step into Java runtime libraries.
There are a number of tools that come with the JDK that don't come with the JRE - JConsole (http://java.sun.com/developer/technicalArticles/J2SE/jconsole.html) springs to mind. This for example can help you understand & monitor the memory usage of your application and so on. Either way if you head into unfamiliar territory, I highly recommend you follow the Eclipse suggestion and use the JDK!
JDK is equipped with different helpful tools, as DotMasta mentioned. Eclipse's "version" of JDK is called JDT. Apart from range of shipped tools, there are also differences between javac and Eclipse built-in compiler ecj, so check here to see the comparison. One of the most important differences is that javac is strict, i.e. with ecj you can create a class file even in case of errors in code, which is perfectly suitable for testing phase, but not for launch :)
JDK contains software development tools which are used to compile and run the Java program.
Plenty of classes and methods in standard jdk library
Javac java compiler
Diffrences and why you will need this?
JDK includes the JVM, standard class libraries, and several other tools that a developer needs in order to create a Java program.
JRE includes the JVM, as the JRE provides some standard libraries and the JVM which can be used to execute a Java program.
You can even look there: http://en.wikipedia.org/wiki/Java_Development_Kit
Since adding the Blackberry Java classes from their website into eclipse, I've had it where eclipse will randomly close, with no discernible pattern, rhyme, error or reason. Here is the environment/software packages that I am using:
Windows XP SP2
Eclipse v3.5.1
Blackberry Java Plugin v1.1.1.200911111641-15
Blackberry Java SDK 4.5.0.21
I've tried the usual steps of complete uninstall and reinstallation of Eclipse and the accompanying plugins on multiple systems with the same configuration, including one that had a fresh install of Windows XP SP2. Upgrading to Eclipse 3.6 didn't work (the plugin wont' install as it's the wrong version), nor the downgrade to 3.4 for the same reason. I also increased the heap size to 512 (system has two gigs of memory) as some research into Eclipse doing this type of thing with Groovy was resolved that way, but again, no dice. Eclipse works great when the blackberry plugins are not installed, and no entries of errors or issues in the event log are helping to show what the issue with these plug-ins might be.
So if anyone has ran into this issue, and even better, has a solution, I'd love to hear about it. Thanks in advance.
EDIT: An additional to my issue, autoComplete with the Blackberry SDK seems to make this extremely unstable, like almost a guaranteed crash. Is this fixable at all?
For anyone that loads this question up trying to find a solution, I've never found a fix. It seems to be a bug with this version of the IDE. If there is a fix, please post.
Did you try to downgrade Eclipse to 3.4 (Ganymede)? I experienced similar issues when I tried upgrading Eclipse to something greater than 3.4.2.
I think the problem is with the plugin, not the IDE. Eclipse has always been stable for me until I installed the BB plugin. Since then it crashes all the time. Since I've installed the release (non-beta) version of the plugin that was recently released I can't even get my project to build.
This could be a manifestation of this bug in Eclipse. Check your C:\eclipse directory for files like hs_err_pidxxxx.log. The file goes on to explain this error:
#
# A fatal error has been detected by the Java Runtime Environment:
#
# EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x753ba053, pid=3144, tid=5820
#
# JRE version: 6.0_20-b02
# Java VM: Java HotSpot(TM) Client VM (16.3-b01 mixed mode, sharing windows-x86 )
# Problematic frame:
# C [USP10.dll+0x1a053]
I've been experiencing this as well. It's completely debilitating. It causes Eclipse to just up and crash out of nowhere (and programming in a language as verbose as Java without Content-Assist is insane).
The bug has been fixed in Eclipse 3.6M7, but unfortunately I can't get the JDE Plug-in to install in the latest release candidate.
This is a known issue with Eclipse 3.5.X and has been fixed for 3.6.0
Bug Ticket link on Eclipse Bugzilla: https://bugs.eclipse.org/bugs/show_bug.cgi?id=283503
Looks like we are stuck with this until the next update to the BB Eclipse plugin.
I've installed Eclipse on a Windows machine some time ago. A couple of days back I was doing some Java coding and I noticed I don't have a JDK, but still Eclipse could compile & run the Java classes. Does it have a compiler included?
Yes Eclipse contains it's own incremental compiler.
An incremental Java compiler.
Implemented as an Eclipse builder, it
is based on technology evolved from
VisualAge for Java compiler. In
particular, it allows to run and debug
code which still contains unresolved
errors.
For some history take a look here:
http://onjava.com/pub/a/onjava/2006/06/28/whats-new-in-eclipse-3-2-java-development-tools.html
Yes. And here's some more characters.