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Re: [tycho-user] Tycho build fails using tycho version 1.4.0 with JDK 11 
> This is new for Java 11
This is not completely true, OSGi has ALWAYS required to import javax.* packages as least since R4 (I don't have any older spec at hand). From R7 on [1] you should even import java.* packages if you target Java >= 9!
It is just Eclipse PDE[2] that does not respect this and don't complain about and Equinox (where Eclipse is running) has a osgi.compatibility.bootdelegation switch[3] to make bundles work that relies on this behavior. To make things even worse, the default for equinox is false, but for the equinox launcher executable the default is true!
So it is true that java 11 is the first JRE where you can't ignore this issue, but this 'compatibility' should have been removed long time ago. The sad thing is, because PDE still does not support this (Bug is over 10 years old), people are writing more and more of those code and its getting harder and harder to remove that.
So if you really want to target Java 9 (and not just compile code with Java 9 language features) one should upgrade to a R7 compatible framework, make sure that delegation is not in place and import all require javax.*/java.* packages in bundle manifest-headers. 


[1] https://blog.osgi.org/2018/02/osgi-r7-highlights-java-9-support.html
[2] https://bugs.eclipse.org/bugs/show_bug.cgi?id=164188
[3] https://help.eclipse.org/neon/index.jsp?topic=%2Forg.eclipse.platform.doc.isv%2Freference%2Fmisc%2Fruntime-options.html 

Am 22.11.19 um 11:48 schrieb Jörg Schaible:
Your plugins must declare dependencies to the plugins (javax.xml.*) containing these classes from the target platform. This is new for Java 11, since these classes have been removed from the Java Runtime. This is actually the same reason why older Eclipse releases do not run on Java 11 - because the plugins do not declare this dependency. 

Am Freitag, 22. November 2019, 11:38:36 CET schrieb Sravan K Lakkimsetti:

Hi,
This requires expertise from Tycho team. Hopefully Alex or Michael Istria able to help you out. 

Thanks

Sravan

From: maragani.veeru <maraganiveera@xxxxxxxxx>
Sent: 22 November 2019 14:40
To: Tycho user list <tycho-user@xxxxxxxxxxx>
Subject: [EXTERNAL] Re: [tycho-user] Tycho build fails using tycho version 1.4.0 with JDK 11 

Ok thanks that was resolved ,but i am facing one issue.
Actually in my plugins code i used one dependency java.xml from Jdk-11 ,but when am trying to build the plugins with tycho it is giving the compilations errors ,because tycho is not able to find that dependency from JDK ,how can we make it available that java.xml from JDK-11 in build process ? 

Can you please let me know.

BUILD FAILURE
[INFO] ------------------------------------------------------------------------ 
[INFO] Total time:  05:14 min
[INFO] Finished at: 2019-11-22T14:34:15+05:30
[INFO] ------------------------------------------------------------------------ [ERROR] Failed to execute goal org.eclipse.tycho:tycho-compiler-plugin:1.5.1:compile (default-compile) on project com.spacetimeinsight.sistudio.common.model: Compilation failure: Compilation failure: [ERROR] C:\Users\maragani\git\SIStudio-Java11\com.spacetimeinsight.sistudio.common.model\src\com\spacetimeinsight\sistudio\model\emf\util\XMLPersistenceMappingLoadImpl.java:[5] 
[ERROR] import javax.xml.parsers.ParserConfigurationException;
[ERROR]       ^^^^^^^^^^^^^^^^^
[ERROR] The package javax.xml.parsers is accessible from more than one module: <unnamed>, java.xml [ERROR] C:\Users\maragani\git\SIStudio-Java11\com.spacetimeinsight.sistudio.common.model\src\com\spacetimeinsight\sistudio\model\emf\util\XMLPersistenceMappingLoadImpl.java:[6] 
[ERROR] import javax.xml.parsers.SAXParser;
[ERROR]       ^^^^^^^^^^^^^^^^^
[ERROR] The package javax.xml.parsers is accessible from more than one module: <unnamed>, java.xml [ERROR] C:\Users\maragani\git\SIStudio-Java11\com.spacetimeinsight.sistudio.common.model\src\com\spacetimeinsight\sistudio\model\emf\util\XMLPersistenceMappingLoadImpl.java:[7] 
[ERROR] import javax.xml.parsers.SAXParserFactory;
[ERROR]       ^^^^^^^^^^^^^^^^^
[ERROR] The package javax.xml.parsers is accessible from more than one module: <unnamed>, java.xml [ERROR] C:\Users\maragani\git\SIStudio-Java11\com.spacetimeinsight.sistudio.common.model\src\com\spacetimeinsight\sistudio\model\emf\util\XMLPersistenceMappingLoadImpl.java:[11] 
[ERROR] import org.xml.sax.SAXException;
On Fri, Nov 22, 2019 at 12:22 PM Sravan K Lakkimsetti <sravankumarl@xxxxxxxxxx <mailto:sravankumarl@xxxxxxxxxx>> wrote: 

Hi,
Latest version of Tycho is 1.5.1 and at eclipse platform project we use it with Java 11. Can you try Tycho version 1.5.1? 

Thanks

Sravan
From: maragani.veeru <maraganiveera@xxxxxxxxx <mailto:maraganiveera@xxxxxxxxx>> 
Sent: 21 November 2019 11:18
To: Tycho user list <tycho-user@xxxxxxxxxxx <mailto:tycho-user@xxxxxxxxxxx>>
Subject: [EXTERNAL] [tycho-user] Tycho build fails using tycho version 1.4.0 with JDK 11 

Hi ,
Recently i upgraded all my target platform plugins to latest like the above attached file.
When i am trying to build the plugins with tycho version 1.4.0 with JDK 11, i am facing the below error , 
can you please let me know the problem.



[INFO] Scanning for projects...
[ERROR] Internal error: de.pdark.decentxml.XMLParseException: Line 2416, column 4: Expected '<!--' -> [Help 1] org.apache.maven.InternalErrorException: Internal error: de.pdark.decentxml.XMLParseException: Line 2416, column 4: Expected '<!--' 
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:120)
at org.apache.maven.cli.MavenCli.execute(MavenCli.java:956)
at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:192)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:282) at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:225) at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:406) 
at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:347)
Caused by: de.pdark.decentxml.XMLParseException: Line 2416, column 4: Expected '<!--' 
at de.pdark.decentxml.XMLTokenizer.parseComment(XMLTokenizer.java:454)
at de.pdark.decentxml.XMLTokenizer.parseExcalamation(XMLTokenizer.java:372)
at de.pdark.decentxml.XMLTokenizer.parseBeginSomething(XMLTokenizer.java:305) 
at de.pdark.decentxml.XMLTokenizer.next(XMLTokenizer.java:235)
at de.pdark.decentxml.XMLParser.parseElementContent(XMLParser.java:835)
at de.pdark.decentxml.XMLParser.parseElement(XMLParser.java:821)
at de.pdark.decentxml.XMLParser.parse(XMLParser.java:159)
at org.eclipse.tycho.model.Feature.read(Feature.java:213)
at org.eclipse.tycho.model.Feature.read(Feature.java:208)
at org.eclipse.tycho.model.Feature.loadFeature(Feature.java:266)
at org.eclipse.tycho.core.osgitools.EclipseFeatureProject.setupProject(EclipseFeatureProject.java:53) at org.eclipse.tycho.core.resolver.DefaultTychoResolver.setupProject(DefaultTychoResolver.java:75) at org.eclipse.tycho.core.maven.TychoMavenLifecycleParticipant.afterProjectsRead(TychoMavenLifecycleParticipant.java:90) 
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:264)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:192)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:105)
... 11 more
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch. 
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles: [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/InternalErrorException 

Thanks,

Veera

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