Update dependencies (and make jar much smaller).

build.gradle

 import org.jastadd.relast.plugin.RelastTest
 
+apply plugin: "com.github.ben-manes.versions"
 apply plugin: 'java'
+apply plugin: 'java-library'
 apply plugin: 'jastadd'
 apply plugin: 'application'
 apply plugin: "idea"
@@ -21,20 +23,21 @@ buildscript {
     repositories.jcenter()
     dependencies {
         classpath 'org.jastadd:jastaddgradle:1.13.3'
+        classpath "com.github.ben-manes:gradle-versions-plugin:0.34.0"
     }
 }
 
+dependencyUpdates.gradleReleaseChannel="current"
+dependencyUpdates.revision="release"
+
 dependencies {
-    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.4.0'
-    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.4.0'
-    testCompile 'org.assertj:assertj-core:3.12.1'
-    compile 'com.fasterxml.jackson.core:jackson-core:2.9.8'
-    compile 'com.fasterxml.jackson.core:jackson-databind:2.9.8'
-    compile 'org.jastadd:jastadd:2.3.4'
-    runtime 'org.jastadd:jastadd:2.3.4'
-    compile group: 'net.sf.beaver', name: 'beaver-rt', version: '0.9.11'
-    compile group: 'org.apache.logging.log4j', name: 'log4j-api', version: '2.10.0'
-    compile group: 'org.apache.logging.log4j', name: 'log4j-core', version: '2.10.0'
+    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.7.0'
+    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.7.0'
+    testImplementation 'org.assertj:assertj-core:3.18.0'
+    testImplementation 'com.fasterxml.jackson.core:jackson-core:2.11.3'
+    testImplementation 'com.fasterxml.jackson.core:jackson-databind:2.11.3'
+    implementation group: 'org.jastadd', name: 'jastadd', version: '2.3.4'
+    api group: 'net.sf.beaver', name: 'beaver-rt', version: '0.9.11'
 }
 
 File genSrc = file("src/gen/java")

src/test/java/org/jastadd/relast/tests/Errors.java

 package org.jastadd.relast.tests;
 
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
 import org.jastadd.relast.compiler.Compiler;
 import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.Test;
@@ -20,7 +18,6 @@ import static org.jastadd.relast.tests.TestHelpers.readFile;
 
 class Errors {
 
-  private static final Logger logger = LogManager.getLogger(Errors.class);
   private static final String FILENAME_PATTERN = "$FILENAME";
 
   @Test
@@ -61,7 +58,7 @@ class Errors {
     String expectedFile = "./src/test/jastadd/errors/" + name + ".expected";
 
     try {
-      logger.debug("user.dir: {}", System.getProperty("user.dir"));
+      System.out.println("user.dir: " + System.getProperty("user.dir"));
       int returnValue = exec(Compiler.class, inFiles.toArray(new String[0]), new File(outFile));
       Assertions.assertEquals(1, returnValue, "Relast did not return with value 1");
     } catch (IOException | InterruptedException e) {
@@ -86,7 +83,7 @@ class Errors {
 
     Assertions.assertLinesMatch(expectedList, outList);
 
-    logger.info("relast for " + name + " returned \n{}", out);
+    System.out.println("relast for " + name + " returned \n" + out);
   }