Hey!
I try to work a bit with Xtend and Xcore for a student project. For that, I configured a Maven project with dependencies to generate xtend/xcore sources by the Maven "generate-sources" phase.
Xtend classes and Xcore models are well compiled to Java, but it seems that a Xtend constant (val) in a try-with-resource is not compile to a final variable in Java when I execute the "mvn clean generate-sources" command.
However, when Eclipse compile the xtend/xcore classes, this problem does not appear.
I reproducted the problem in a minimal project:
Bar Xtend class:
class Bar {
def static void main(String... args) {
try(val foo = new BufferedInputStream(System.in)) {
val bar = [| bar(foo)]
bar.apply
}
}
def static void bar(BufferedInputStream bis) {
System.out.println(new BufferedReader((new InputStreamReader(bis))).lines().collect(Collectors.joining("\n")))
}
}
Product code by Maven:
public class Bar {
public static void main(final String... args) {
try {
List<Throwable> _ts = new ArrayList<Throwable>();
BufferedInputStream foo = null;
try {
foo = new BufferedInputStream(System.in);
final Procedure0 _function = new Procedure0() {
public void apply() {
Bar.bar(foo);
}
};
final Procedure0 bar = _function;
bar.apply();
} finally {
if (foo != null) {
try {
foo.close();
} catch (Throwable _t) {
_ts.add(_t);
}
}
if(!_ts.isEmpty()) throw Exceptions.sneakyThrow(_ts.get(0));
}
} catch (Throwable _e) {
throw Exceptions.sneakyThrow(_e);
}
}
public static void bar(final BufferedInputStream bis) {
InputStreamReader _inputStreamReader = new InputStreamReader(bis);
System.out.println(new BufferedReader(_inputStreamReader).lines().collect(Collectors.joining("\n")));
}
}
The product code has a compilation error. Indeed, the line 10 (Bar.bar(foo);), throw "Local variable foo defined in an enclosing scope must be final or effectively final".
To compare, product code by Eclipse:
@SuppressWarnings("all")
public class Bar {
public static void main(final String... args) {
try {
try (final BufferedInputStream foo = new BufferedInputStream(System.in)) {
final Procedure0 _function = () -> {
Bar.bar(foo);
};
final Procedure0 bar = _function;
bar.apply();
}
} catch (Throwable _e) {
throw Exceptions.sneakyThrow(_e);
}
}
public static void bar(final BufferedInputStream bis) {
InputStreamReader _inputStreamReader = new InputStreamReader(bis);
System.out.println(new BufferedReader(_inputStreamReader).lines().collect(Collectors.joining("\n")));
}
}
I have the impression that Maven does not compile to Java 8 code but I think I set up the version in the pom.xml.
My pom.xml for the minimal project:
<modelVersion>4.0.0</modelVersion>
<groupId>fr.theogiraudet</groupId>
<version>1.0.0-SNAPSHOT</version>
<artifactId>fr.theogiraudet.foo</artifactId>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<core-resources-version>3.7.100</core-resources-version>
<emf-version>2.23.0</emf-version>
<emf-common-version>2.21.0</emf-common-version>
<xtext-version>2.24.0</xtext-version>
<ecore-xtext-version>1.5.0</ecore-xtext-version>
<ecore-xcore-version>1.16.0</ecore-xcore-version>
<ecore-xcore-lib-version>1.5.0</ecore-xcore-lib-version>
<xtend-path>${basedir}/src/main/xtend</xtend-path>
<xcore-path>${basedir}/model</xcore-path>
<xtend-gen-path>${basedir}/src/main/javagen</xtend-gen-path>
<xcore-gen-path>${basedir}/src/main/javagen</xcore-gen-path>
</properties>
<dependencies>
<dependency>
<groupId>org.eclipse.emf</groupId>
<artifactId>org.eclipse.emf.common</artifactId>
<version>${emf-common-version}</version>
</dependency>
<dependency>
<groupId>org.eclipse.emf</groupId>
<artifactId>org.eclipse.emf.ecore</artifactId>
<version>${emf-version}</version>
</dependency>
<dependency>
<groupId>org.eclipse.emf</groupId>
<artifactId>org.eclipse.emf.ecore.xcore.lib</artifactId>
<version>${ecore-xcore-lib-version}</version>
</dependency>
<dependency>
<groupId>org.eclipse.xtext</groupId>
<artifactId>org.eclipse.xtext.xbase.lib</artifactId>
<version>${xtext-version}</version>
</dependency>
<dependency>
<groupId>org.eclipse.xtend</groupId>
<artifactId>org.eclipse.xtend.lib</artifactId>
<version>${xtext-version}</version>
</dependency>
<dependency>
<groupId>org.eclipse.emf</groupId>
<artifactId>org.eclipse.emf.ecore.xmi</artifactId>
<version>2.16.0</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.3</version>
</plugin>
<plugin>
<artifactId>maven-clean-plugin</artifactId>
<version>2.6.1</version>
<configuration>
<filesets>
<fileset>
<excludes>
<exclude>.dummy.txt</exclude>
</excludes>
<directory>${xtend-gen-path}</directory>
</fileset>
<fileset>
<excludes>
<exclude>.dummy.txt</exclude>
</excludes>
<directory>${xtend-gen-path}</directory>
</fileset>
</filesets>
</configuration>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>build-helper-maven-plugin</artifactId>
<version>1.9.1</version>
<executions>
<execution>
<id>add-source</id>
<phase>generate-sources</phase>
<goals>
<goal>add-source</goal>
</goals>
<configuration>
<sources>
<source>${xtend-gen-path}</source>
</sources>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.eclipse.xtext</groupId>
<artifactId>xtext-maven-plugin</artifactId>
<version>${xtext-version}</version>
<executions>
<execution>
<phase>generate-sources</phase>
<goals>
<goal>generate</goal>
</goals>
</execution>
</executions>
<configuration>
<languages>
<language>
<setup>org.eclipse.emf.codegen.ecore.xtext.GenModelSupport</setup>
</language>
<language>
<setup>org.eclipse.xtend.core.XtendStandaloneSetup</setup>
<outputConfigurations>
<outputConfiguration>
<outputDirectory>${xtend-gen-path}</outputDirectory>
</outputConfiguration>
</outputConfigurations>
</language>
<language>
<setup>org.eclipse.emf.ecore.xcore.XcoreStandaloneSetup</setup>
<outputConfigurations>
<outputConfiguration>
<outputDirectory>${xcore-gen-path}</outputDirectory>
</outputConfiguration>
</outputConfigurations>
</language>
</languages>
<sourceRoots>
<root>${xtend-path}</root>
<root>${xcore-path}</root>
</sourceRoots>
<javaSourceVersion>1.8</javaSourceVersion>
</configuration>
<dependencies>
<dependency>
<groupId>org.eclipse.core</groupId>
<artifactId>org.eclipse.core.resources</artifactId>
<version>${core-resources-version}</version>
</dependency>
<dependency>
<groupId>org.eclipse.xtend</groupId>
<artifactId>org.eclipse.xtend.core</artifactId>
<version>${xtext-version}</version>
</dependency>
<dependency>
<groupId>org.eclipse.emf</groupId>
<artifactId>org.eclipse.emf.codegen.ecore.xtext</artifactId>
<version>${ecore-xtext-version}</version>
</dependency>
<dependency>
<groupId>org.eclipse.emf</groupId>
<artifactId>org.eclipse.emf.ecore.xcore</artifactId>
<version>${ecore-xcore-version}</version>
</dependency>
<dependency>
<groupId>org.eclipse.emf</groupId>
<artifactId>org.eclipse.emf.ecore.xcore.lib</artifactId>
<version>${ecore-xcore-lib-version}</version>
</dependency>
</dependencies>
</plugin>
</plugins>
</build>
For Eclipse, I use:
- Xtend IDE plugin (v.2.24.0)
- Xtext Complete SDK (v.2.24.0)
- EMF - Eclipse Modeling Framework Xcore SDK (v.1.16.0)
You can clone the minimal project here:
theogiraudet/XtendMinimalProject.git
Thank you in advance for your help!
[Updated on: Sat, 30 January 2021 16:41]
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