Fix maven build.

compiler/cli/src/org/jetbrains/jet/cli/common/CLICompiler.java

@@ -86,7 +86,7 @@ public abstract class CLICompiler<A extends CompilerArguments, C extends Compile
      * based tools to customise their own plugins
      */
     //TODO: add parameter annotations when KT-1863 is resolved
-    protected void configureEnvironment(C configuration, A arguments) {
+    protected void configureEnvironment(@NotNull C configuration, @NotNull A arguments) {
         List<CompilerPlugin> plugins = arguments.getCompilerPlugins();
         configuration.getCompilerPlugins().addAll(plugins);
     }

compiler/cli/src/org/jetbrains/jet/cli/jvm/K2JVMCompiler.java

@@ -175,7 +175,7 @@ public class K2JVMCompiler extends CLICompiler<K2JVMCompilerArguments, K2JVMComp
 
 
     @Override
-    protected void configureEnvironment(K2JVMCompileEnvironmentConfiguration configuration, K2JVMCompilerArguments arguments) {
+    protected void configureEnvironment(@NotNull K2JVMCompileEnvironmentConfiguration configuration, @NotNull K2JVMCompilerArguments arguments) {
         super.configureEnvironment(configuration, arguments);
 
         if (configuration.getEnvironment().getCompilerDependencies().getRuntimeJar() != null) {

libraries/tools/kdoc/src/main/kotlin/org/jetbrains/kotlin/doc/KDocCompiler.kt

@@ -22,7 +22,7 @@ fun main(args: Array<String?>): Unit {
  */
 class KDocCompiler() : K2JVMCompiler() {
 
-    protected override fun configureEnvironment(configuration : CompileEnvironmentConfiguration?, arguments : K2JVMCompilerArguments?) {
+    protected override fun configureEnvironment(configuration : K2JVMCompileEnvironmentConfiguration, arguments : K2JVMCompilerArguments) {
         super.configureEnvironment(configuration, arguments)
         val coreEnvironment = configuration?.getEnvironment()
         if (coreEnvironment != null) {