Replace calls to <class>.newInstance with <class>.getConstructor().newInstance.

This is safer; newInstance on class objects bypasses exception checking.

--
MOS_MIGRATED_REVID=129976805

src/main/java/com/google/devtools/build/docgen/RuleDocumentationAttribute.java

diff --git a/src/main/java/com/google/devtools/build/docgen/RuleDocumentationAttribute.java b/src/main/java/com/google/devtools/build/docgen/RuleDocumentationAttribute.java
index 02357ff..41091af 100644
--- a/src/main/java/com/google/devtools/build/docgen/RuleDocumentationAttribute.java
+++ b/src/main/java/com/google/devtools/build/docgen/RuleDocumentationAttribute.java
@@ -23,7 +23,6 @@
 import com.google.devtools.build.lib.packages.BuildType;
 import com.google.devtools.build.lib.packages.TriState;
 import com.google.devtools.build.lib.syntax.Type;
-
 import java.util.HashMap;
 import java.util.LinkedList;
 import java.util.Map;
@@ -258,8 +257,8 @@
       ConfiguredRuleClassProvider ruleClassProvider) {
     if (ruleClassProvider == null) {
       try {
-        return usingClass.newInstance();
-      } catch (IllegalAccessException | InstantiationException e) {
+        return usingClass.getConstructor().newInstance();
+      } catch (ReflectiveOperationException | IllegalArgumentException e) {
         throw new IllegalStateException(e);
       }
     }

src/main/java/com/google/devtools/build/lib/runtime/BlazeRuntime.java

diff --git a/src/main/java/com/google/devtools/build/lib/runtime/BlazeRuntime.java b/src/main/java/com/google/devtools/build/lib/runtime/BlazeRuntime.java
index dc4920d..5a4ebd0 100644
--- a/src/main/java/com/google/devtools/build/lib/runtime/BlazeRuntime.java
+++ b/src/main/java/com/google/devtools/build/lib/runtime/BlazeRuntime.java
@@ -527,7 +527,7 @@
     ImmutableList.Builder<BlazeModule> result = ImmutableList.builder();
     for (Class<? extends BlazeModule> moduleClass : moduleClasses) {
       try {
-        BlazeModule module = moduleClass.newInstance();
+        BlazeModule module = moduleClass.getConstructor().newInstance();
         result.add(module);
       } catch (Throwable e) {
         throw new IllegalStateException("Cannot instantiate module " + moduleClass.getName(), e);
@@ -782,11 +782,11 @@
       // gRPC server is not compiled in so that we don't need gRPC for bootstrapping.
       Class<?> factoryClass = Class.forName(
           "com.google.devtools.build.lib.server.GrpcServerImpl$Factory");
-      RPCServer.Factory factory = (RPCServer.Factory) factoryClass.newInstance();
+      RPCServer.Factory factory = (RPCServer.Factory) factoryClass.getConstructor().newInstance();
       return factory.create(commandExecutor, runtime.getClock(),
           startupOptions.commandPort, runtime.getServerDirectory(),
           startupOptions.maxIdleSeconds);
-    } catch (ClassNotFoundException | InstantiationException | IllegalAccessException e) {
+    } catch (ReflectiveOperationException | IllegalArgumentException e) {
       throw new AbruptExitException("gRPC server not compiled in", ExitCode.BLAZE_INTERNAL_ERROR);
     }
   }