Use NoSuchFileException for missing files (#58)

Author: Technici4n

src/main/java/cpw/mods/cl/ModuleClassLoader.java

@@ -2,7 +2,6 @@
 
 import cpw.mods.util.LambdaExceptionUtils;
 
-import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.UncheckedIOException;
@@ -13,6 +12,7 @@
 import java.net.MalformedURLException;
 import java.net.URI;
 import java.net.URL;
+import java.nio.file.NoSuchFileException;
 import java.util.*;
 import java.util.function.BiFunction;
 import java.util.function.Consumer;
@@ -279,8 +279,11 @@ protected Class<?> findClass(final String moduleName, final String name) {
     }
 
     protected <T> T loadFromModule(final String moduleName, BiFunction<ModuleReader, ModuleReference, T> lookup) throws IOException {
-        var module = configuration.findModule(moduleName).orElseThrow(FileNotFoundException::new);
-        var ref = module.reference();
+        var module = configuration.findModule(moduleName);
+        if (module.isEmpty()) {
+            throw new NoSuchFileException("module " + moduleName);
+        }
+        var ref = module.get().reference();
         try (var reader = ref.open()) {
             return lookup.apply(reader, ref);
         }

src/main/java/cpw/mods/niofs/union/UnionFileSystem.java

@@ -365,9 +365,12 @@ private Path toRealPath(final Path basePath, final UnionPath path) {
 
     public SeekableByteChannel newReadByteChannel(final UnionPath path) throws IOException {
         try {
-            return findFirstFiltered(path)
-                    .map(this::byteChannel)
-                    .orElseThrow(FileNotFoundException::new);
+            var ret = findFirstFiltered(path).map(this::byteChannel);
+            if (ret.isPresent()) {
+                return ret.get();
+            } else {
+                throw new NoSuchFileException(path.toString());
+            }
         } catch (UncheckedIOException ioe) {
             throw ioe.getCause();
         }

src/test/java/cpw/mods/niofs/union/TestUnionFS.java

@@ -2,7 +2,6 @@
 
 import org.junit.jupiter.api.Test;
 
-import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.nio.file.FileSystems;
 import java.nio.file.Files;
@@ -267,7 +266,7 @@ public void testDirectoryVisitorJar() throws Exception {
                         .peek(path -> foundFiles.add(path.toString()))
                         .map(p-> ()-> {
                             if (!Files.exists(p)) {
-                                throw new FileNotFoundException(p.toString());
+                                throw new NoSuchFileException(p.toString());
                             }
                         })
             );