feat(java): remove dependency on google Guava

packages/jsii-java-runtime/pom.xml.t.js

@@ -51,7 +51,6 @@ process.stdout.write(`<?xml version="1.0" encoding="UTF-8"?>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <!-- Versions of the dependencies -->
         <findbugs.version>[3.0.2,3.1.0)</findbugs.version>
-        <guava.version>[27.0.1-jre,27.1)</guava.version>
         <jackson.version>[2.9.8,2.10.0)</jackson.version>
         <javax.annotations.version>[1.3.2,1.4.0)</javax.annotations.version>
         <junit.version>[5.4.1,5.5.0)</junit.version>
@@ -73,13 +72,6 @@ process.stdout.write(`<?xml version="1.0" encoding="UTF-8"?>
             <version>\${jackson.version}</version>
         </dependency>
 
-        <!-- https://mvnrepository.com/artifact/com.google.guava/guava -->
-        <dependency>
-            <groupId>com.google.guava</groupId>
-            <artifactId>guava</artifactId>
-            <version>\${guava.version}</version>
-        </dependency>
-
         <!-- https://mvnrepository.com/artifact/com.google.code.findbugs/jsr305 -->
         <dependency>
             <groupId>com.google.code.findbugs</groupId>

packages/jsii-java-runtime/project/src/main/java/software/amazon/jsii/JsiiEngine.java

@@ -8,8 +8,9 @@
 
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.JsonNode;
-import com.google.common.base.Throwables;
 
+import java.io.PrintWriter;
+import java.io.StringWriter;
 import java.lang.reflect.Constructor;
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
@@ -388,7 +389,11 @@ private Object invokeMethod(final Object obj, final Method method, final Object.
             try {
                 return method.invoke(obj, args);
             } catch (Exception e) {
-                this.log("Error while invoking %s with %s: %s", method, Arrays.toString(args), Throwables.getStackTraceAsString(e));
+                final StringWriter sw = new StringWriter();
+                try (final PrintWriter pw = new PrintWriter(sw)) {
+                    e.printStackTrace(pw);
+                }
+                this.log("Error while invoking %s with %s: %s", method, Arrays.toString(args), sw.toString());
                 throw e;
             }
         } catch (InvocationTargetException e) {

packages/jsii-java-runtime/project/src/main/java/software/amazon/jsii/JsiiObjectMapper.java

@@ -26,7 +26,6 @@
 import com.fasterxml.jackson.databind.module.SimpleModule;
 import com.fasterxml.jackson.databind.type.MapLikeType;
 import com.fasterxml.jackson.databind.type.MapType;
-import com.google.common.annotations.VisibleForTesting;
 
 /**
  * Provides a correctly configured JSON processor for handling JSII requests and responses.
@@ -88,7 +87,6 @@ private JsiiObjectMapper() {
     this(JsiiEngine.getInstance());
   }
 
-  @VisibleForTesting
   JsiiObjectMapper(final JsiiEngine jsiiEngine) {
     this.jsiiEngine = jsiiEngine;
 
@@ -105,7 +103,6 @@ private JsiiObjectMapper() {
     this.objectMapper.registerModule(module);
   }
 
-  @VisibleForTesting
   ObjectMapper getObjectMapper() {
     return this.objectMapper;
   }

packages/jsii-java-runtime/project/src/test/java/software/amazon/jsii/JsiiObjectMapperTest.java

@@ -4,12 +4,15 @@
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.when;
 
+import java.io.BufferedReader;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.nio.charset.Charset;
 import java.time.Instant;
 import java.util.List;
+import java.util.stream.Collectors;
 
 import com.fasterxml.jackson.databind.ObjectMapper;
-import com.google.common.base.Charsets;
-import com.google.common.io.Resources;
 
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
@@ -38,18 +41,21 @@ public void testDeserialization() throws Exception {
 
     when((TestEnum) jsiiEngine.findEnumValue("module.Enum#value")).thenReturn(TestEnum.DUMMY);
 
-    final String json =
-        Resources.toString(Resources.getResource(this.getClass(), "complex-callback.json"), Charsets.UTF_8);
-    final TestCallback callback = subject.treeToValue(subject.readTree(json), TestCallback.class);
-
-    assertEquals("CallbackID", callback.getCbid());
-    assertNotNull(callback.getInvoke());
-    if (callback.getCbid() != null) {
-      assertEquals("methodName", callback.getInvoke().getMethod());
-      assertEquals(1337, callback.getInvoke().getArgs().get(0));
-      assertEquals(mockObject1, callback.getInvoke().getArgs().get(1));
-      assertEquals(Instant.ofEpochMilli(1553624863569L), callback.getInvoke().getArgs().get(2));
-      assertEquals(TestEnum.DUMMY, callback.getInvoke().getArgs().get(3));
+    try (final InputStream stream = this.getClass().getResourceAsStream("complex-callback.json");
+         final InputStreamReader reader = new InputStreamReader(stream, Charset.forName("UTF-8"));
+         final BufferedReader buffered = new BufferedReader(reader)) {
+      final String json = buffered.lines().collect(Collectors.joining("\n"));
+      final TestCallback callback = subject.treeToValue(subject.readTree(json), TestCallback.class);
+
+      assertEquals("CallbackID", callback.getCbid());
+      assertNotNull(callback.getInvoke());
+      if (callback.getCbid() != null) {
+        assertEquals("methodName", callback.getInvoke().getMethod());
+        assertEquals(1337, callback.getInvoke().getArgs().get(0));
+        assertEquals(mockObject1, callback.getInvoke().getArgs().get(1));
+        assertEquals(Instant.ofEpochMilli(1553624863569L), callback.getInvoke().getArgs().get(2));
+        assertEquals(TestEnum.DUMMY, callback.getInvoke().getArgs().get(3));
+      }
     }
   }