strip more stuff we don't need

pom.xml

@@ -119,7 +119,6 @@
         <directory>resources</directory>
       </resource>
     </resources>
-    <testSourceDirectory>test</testSourceDirectory>
     <testResources>
       <testResource>
         <directory>test</directory>
@@ -130,6 +129,7 @@
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-compiler-plugin</artifactId>
+          <version>3.6.0</version>
           <configuration>
             <source>${maven.compiler.source}</source>
             <target>${maven.compiler.target}</target>

runtime-testsuite/processors/pom.xml

@@ -51,10 +51,6 @@
 					</compilerArgument>
 				</configuration>
 			</plugin>
-			<plugin>
-				<artifactId>maven-jar-plugin</artifactId>
-				<version>2.4</version>
-			</plugin>
 		</plugins>
 	</build>
 </project>

runtime/Java/pom.xml

@@ -22,7 +22,7 @@
       <plugin>
         <groupId>org.antlr</groupId>
         <artifactId>antlr4-maven-plugin</artifactId>
-        <version>4.5</version>
+        <version>4.5.3</version> <!-- use older version to process XPathLexer.g4, avoiding cyclic build dependency -->
         <executions>
           <execution>
             <id>antlr</id>
@@ -60,7 +60,6 @@
       </plugin>
       <plugin>
         <artifactId>maven-jar-plugin</artifactId>
-        <version>2.4</version>
         <configuration>
           <archive>
             <manifestFile>${project.build.outputDirectory}/META-INF/MANIFEST.MF</manifestFile>

tool-testsuite/pom.xml

@@ -34,12 +34,14 @@
       <artifactId>antlr4-runtime-testsuite</artifactId>
       <version>${project.version}</version>
 			<scope>test</scope>
+			<type>test-jar</type>
     </dependency>
     <dependency>
       <groupId>org.antlr</groupId>
       <artifactId>antlr4</artifactId>
       <version>${project.version}</version>
 			<scope>test</scope>
+			<type>test-jar</type>
 		</dependency>
     <dependency>
       <groupId>junit</groupId>