diff --git a/jadx-core/src/main/java/jadx/api/ResourcesLoader.java b/jadx-core/src/main/java/jadx/api/ResourcesLoader.java
index fa3d358f6b5..8b1afb291fc 100644
--- a/jadx-core/src/main/java/jadx/api/ResourcesLoader.java
+++ b/jadx-core/src/main/java/jadx/api/ResourcesLoader.java
@@ -22,11 +22,14 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import static jadx.core.utils.files.FileUtils.READ_BUFFER_SIZE;
+import static jadx.core.utils.files.FileUtils.close;
+import static jadx.core.utils.files.FileUtils.copyStream;
+
 // TODO: move to core package
 public final class ResourcesLoader {
 	private static final Logger LOG = LoggerFactory.getLogger(ResourcesLoader.class);
 
-	private static final int READ_BUFFER_SIZE = 8 * 1024;
 	private static final int LOAD_SIZE_LIMIT = 10 * 1024 * 1024;
 
 	private final JadxDecompiler jadxRef;
@@ -70,12 +73,10 @@ public static ResContainer decodeStream(ResourceFile rf, ResourceDecoder decoder
 				if (zipFile != null) {
 					zipFile.close();
 				}
-				if (inputStream != null) {
-					inputStream.close();
-				}
 			} catch (Exception e) {
-				LOG.debug("Error close zip file: {}", zipRef, e);
+				LOG.error("Error close zip file: {}", zipRef, e);
 			}
+			close(inputStream);
 		}
 		return result;
 	}
@@ -149,24 +150,12 @@ private void addEntry(List<ResourceFile> list, File zipFile, ZipEntry entry) {
 		ResourceFile rf = new ResourceFile(jadxRef, name, type);
 		rf.setZipRef(new ZipRef(zipFile, name));
 		list.add(rf);
-		// LOG.debug("Add resource entry: {}, size: {}", name, entry.getSize());
 	}
 
 	public static CodeWriter loadToCodeWriter(InputStream is) throws IOException {
 		CodeWriter cw = new CodeWriter();
 		ByteArrayOutputStream baos = new ByteArrayOutputStream(READ_BUFFER_SIZE);
-		byte[] buffer = new byte[READ_BUFFER_SIZE];
-		int count;
-		try {
-			while ((count = is.read(buffer)) != -1) {
-				baos.write(buffer, 0, count);
-			}
-		} finally {
-			try {
-				is.close();
-			} catch (Exception ignore) {
-			}
-		}
+		copyStream(is, baos);
 		cw.add(baos.toString("UTF-8"));
 		return cw;
 	}
diff --git a/jadx-core/src/main/java/jadx/core/clsp/ClsSet.java b/jadx-core/src/main/java/jadx/core/clsp/ClsSet.java
index e1732ba3f4e..bb9ab61f85e 100644
--- a/jadx-core/src/main/java/jadx/core/clsp/ClsSet.java
+++ b/jadx-core/src/main/java/jadx/core/clsp/ClsSet.java
@@ -27,6 +27,8 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import static jadx.core.utils.files.FileUtils.close;
+
 /**
  * Classes list for import into classpath graph
  */
@@ -115,13 +117,13 @@ void save(File output) throws IOException {
 					out.putNextEntry(new ZipEntry(CLST_PKG_PATH + "/" + CLST_FILENAME));
 					save(out);
 				} finally {
-					out.close();
+					close(out);
 				}
 			} else {
 				throw new JadxRuntimeException("Unknown file format: " + outputName);
 			}
 		} finally {
-			outputStream.close();
+			close(outputStream);
 		}
 	}
 
@@ -144,7 +146,7 @@ public void save(OutputStream output) throws IOException {
 				}
 			}
 		} finally {
-			out.close();
+			close(out);
 		}
 	}
 
@@ -156,7 +158,7 @@ public void load() throws IOException, DecodeException {
 		try {
 			load(input);
 		} finally {
-			input.close();
+			close(input);
 		}
 	}
 
@@ -177,13 +179,13 @@ public void load(File input) throws IOException, DecodeException {
 						entry = in.getNextEntry();
 					}
 				} finally {
-					in.close();
+					close(in);
 				}
 			} else {
 				throw new JadxRuntimeException("Unknown file format: " + name);
 			}
 		} finally {
-			inputStream.close();
+			close(inputStream);
 		}
 	}
 
@@ -213,7 +215,7 @@ public void load(InputStream input) throws IOException, DecodeException {
 				classes[i].setParents(parents);
 			}
 		} finally {
-			in.close();
+			close(in);
 		}
 	}
 
diff --git a/jadx-core/src/main/java/jadx/core/codegen/CodeWriter.java b/jadx-core/src/main/java/jadx/core/codegen/CodeWriter.java
index 6fe3b02b6b4..59da069e66b 100644
--- a/jadx-core/src/main/java/jadx/core/codegen/CodeWriter.java
+++ b/jadx-core/src/main/java/jadx/core/codegen/CodeWriter.java
@@ -16,6 +16,8 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import static jadx.core.utils.files.FileUtils.close;
+
 public class CodeWriter {
 	private static final Logger LOG = LoggerFactory.getLogger(CodeWriter.class);
 	private static final int MAX_FILENAME_LENGTH = 128;
@@ -304,9 +306,7 @@ public void save(File file) {
 		} catch (Exception e) {
 			LOG.error("Save file error", e);
 		} finally {
-			if (out != null) {
-				out.close();
-			}
+			close(out);
 		}
 	}
 }
diff --git a/jadx-core/src/main/java/jadx/core/utils/AsmUtils.java b/jadx-core/src/main/java/jadx/core/utils/AsmUtils.java
index 15c2b7cfe86..7164c63363e 100644
--- a/jadx-core/src/main/java/jadx/core/utils/AsmUtils.java
+++ b/jadx-core/src/main/java/jadx/core/utils/AsmUtils.java
@@ -6,6 +6,8 @@
 
 import org.objectweb.asm.ClassReader;
 
+import static jadx.core.utils.files.FileUtils.close;
+
 public class AsmUtils {
 
 	private AsmUtils() {
@@ -19,9 +21,7 @@ public static String getNameFromClassFile(File file) throws IOException {
 			ClassReader classReader = new ClassReader(in);
 			className = classReader.getClassName();
 		} finally {
-			if (in != null) {
-				in.close();
-			}
+			close(in);
 		}
 		return className;
 	}
diff --git a/jadx-core/src/main/java/jadx/core/utils/files/FileUtils.java b/jadx-core/src/main/java/jadx/core/utils/files/FileUtils.java
index d7e3826de55..8bc4c5ebcff 100644
--- a/jadx-core/src/main/java/jadx/core/utils/files/FileUtils.java
+++ b/jadx-core/src/main/java/jadx/core/utils/files/FileUtils.java
@@ -3,13 +3,22 @@
 import jadx.core.utils.exceptions.JadxRuntimeException;
 
 import java.io.BufferedInputStream;
+import java.io.Closeable;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
 import java.util.jar.JarEntry;
 import java.util.jar.JarOutputStream;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 public class FileUtils {
+	private static final Logger LOG = LoggerFactory.getLogger(FileUtils.class);
+
+	public static final int READ_BUFFER_SIZE = 8 * 1024;
 
 	private FileUtils() {
 	}
@@ -20,21 +29,12 @@ public static void addFileToJar(JarOutputStream jar, File source, String entryNa
 			JarEntry entry = new JarEntry(entryName);
 			entry.setTime(source.lastModified());
 			jar.putNextEntry(entry);
-			in = new BufferedInputStream(new FileInputStream(source));
 
-			byte[] buffer = new byte[8192];
-			while (true) {
-				int count = in.read(buffer);
-				if (count == -1) {
-					break;
-				}
-				jar.write(buffer, 0, count);
-			}
+			in = new BufferedInputStream(new FileInputStream(source));
+			copyStream(in, jar);
 			jar.closeEntry();
 		} finally {
-			if (in != null) {
-				in.close();
-			}
+			close(in);
 		}
 	}
 
@@ -59,4 +59,26 @@ public static File createTempFile(String suffix) {
 		}
 		return temp;
 	}
+
+	public static void copyStream(InputStream input, OutputStream output) throws IOException {
+		byte[] buffer = new byte[READ_BUFFER_SIZE];
+		while (true) {
+			int count = input.read(buffer);
+			if (count == -1) {
+				break;
+			}
+			output.write(buffer, 0, count);
+		}
+	}
+
+	public static void close(Closeable c) {
+		if (c == null) {
+			return;
+		}
+		try {
+			c.close();
+		} catch (IOException e) {
+			LOG.error("Close exception for {}", c, e);
+		}
+	}
 }
diff --git a/jadx-core/src/main/java/jadx/core/utils/files/InputFile.java b/jadx-core/src/main/java/jadx/core/utils/files/InputFile.java
index c6f1834eb9a..b0b29df8ed5 100644
--- a/jadx-core/src/main/java/jadx/core/utils/files/InputFile.java
+++ b/jadx-core/src/main/java/jadx/core/utils/files/InputFile.java
@@ -21,6 +21,8 @@
 
 import com.android.dex.Dex;
 
+import static jadx.core.utils.files.FileUtils.close;
+
 public class InputFile {
 	private static final Logger LOG = LoggerFactory.getLogger(InputFile.class);
 
@@ -96,14 +98,14 @@ private boolean loadFromZip(String ext) throws IOException, DecodeException {
 					try {
 						IOUtils.copy(inputStream, fos);
 					} finally {
-						fos.close();
+						close(fos);
 					}
 					addDexFile(entryName, loadFromJar(jarFile));
 				} else {
 					throw new JadxRuntimeException("Unexpected extension in zip: " + ext);
 				}
 			} finally {
-				inputStream.close();
+				close(inputStream);
 			}
 			index++;
 			if (index == 1) {
@@ -144,12 +146,8 @@ private static Dex loadFromClassFile(File file) throws IOException, DecodeExcept
 			}
 			FileUtils.addFileToJar(jo, file, clsName + ".class");
 		} finally {
-			if (jo != null) {
-				jo.close();
-			}
-			if (out != null) {
-				out.close();
-			}
+			close(jo);
+			close(out);
 		}
 		return loadFromJar(outFile);
 	}
diff --git a/jadx-core/src/main/java/jadx/core/utils/files/JavaToDex.java b/jadx-core/src/main/java/jadx/core/utils/files/JavaToDex.java
index bb8070d8b98..95263d6b549 100644
--- a/jadx-core/src/main/java/jadx/core/utils/files/JavaToDex.java
+++ b/jadx-core/src/main/java/jadx/core/utils/files/JavaToDex.java
@@ -11,6 +11,10 @@
 import com.android.dx.command.dexer.Main;
 import com.android.dx.command.dexer.Main.Arguments;
 
+import static com.android.dx.command.dexer.Main.run;
+import static jadx.core.utils.files.FileUtils.close;
+import static java.lang.System.setOut;
+
 public class JavaToDex {
 
 	private static final String CHARSET_NAME = "UTF-8";
@@ -41,14 +45,14 @@ public byte[] convert(String javaFile) throws JadxException {
 		PrintStream oldOut = System.out;
 		ByteArrayOutputStream baos = new ByteArrayOutputStream();
 		try {
-			System.setOut(new PrintStream(baos, true, CHARSET_NAME));
+			setOut(new PrintStream(baos, true, CHARSET_NAME));
 			DxArgs args = new DxArgs("-", new String[]{javaFile});
 			resetOutDexVar();
-			Main.run(args);
-			baos.close();
+			run(args);
 		} catch (Throwable e) {
 			throw new JadxException("dx exception: " + e.getMessage(), e);
 		} finally {
+			close(baos);
 			System.setOut(oldOut);
 		}
 		try {
diff --git a/jadx-core/src/main/java/jadx/core/xmlgen/ManifestAttributes.java b/jadx-core/src/main/java/jadx/core/xmlgen/ManifestAttributes.java
index 35f51fbce2e..7709442c068 100644
--- a/jadx-core/src/main/java/jadx/core/xmlgen/ManifestAttributes.java
+++ b/jadx-core/src/main/java/jadx/core/xmlgen/ManifestAttributes.java
@@ -19,6 +19,8 @@
 import org.w3c.dom.NodeList;
 import org.xml.sax.SAXException;
 
+import static jadx.core.utils.files.FileUtils.close;
+
 public class ManifestAttributes {
 	private static final Logger LOG = LoggerFactory.getLogger(ManifestAttributes.class);
 
@@ -63,7 +65,8 @@ public void parseAll() throws Exception {
 	}
 
 	private Document loadXML(String xml) throws JadxException, ParserConfigurationException, SAXException, IOException {
-		Document doc;InputStream xmlStream = null;
+		Document doc;
+		InputStream xmlStream = null;
 		try {
 			xmlStream = ManifestAttributes.class.getResourceAsStream(xml);
 			if (xmlStream == null) {
@@ -72,9 +75,7 @@ private Document loadXML(String xml) throws JadxException, ParserConfigurationEx
 			DocumentBuilder dBuilder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
 			doc = dBuilder.parse(xmlStream);
 		} finally {
-			if (xmlStream != null) {
-				xmlStream.close();
-			}
+			close(xmlStream);
 		}
 		return doc;
 	}
diff --git a/jadx-core/src/test/java/jadx/tests/api/IntegrationTest.java b/jadx-core/src/test/java/jadx/tests/api/IntegrationTest.java
index 0389d4f18b9..c46c10dc197 100644
--- a/jadx-core/src/test/java/jadx/tests/api/IntegrationTest.java
+++ b/jadx-core/src/test/java/jadx/tests/api/IntegrationTest.java
@@ -15,7 +15,6 @@
 import jadx.core.dex.visitors.IDexTreeVisitor;
 import jadx.core.utils.exceptions.CodegenException;
 import jadx.core.utils.exceptions.JadxException;
-import jadx.core.utils.files.FileUtils;
 import jadx.tests.api.compiler.DynamicCompiler;
 import jadx.tests.api.compiler.StaticCompiler;
 import jadx.tests.api.utils.TestUtils;
@@ -35,6 +34,8 @@
 import java.util.Map;
 import java.util.jar.JarOutputStream;
 
+import static jadx.core.utils.files.FileUtils.addFileToJar;
+import static jadx.core.utils.files.FileUtils.close;
 import static org.hamcrest.Matchers.containsString;
 import static org.hamcrest.Matchers.empty;
 import static org.hamcrest.Matchers.is;
@@ -261,9 +262,9 @@ public File getJarForClass(Class<?> cls) throws IOException {
 		File temp = createTempFile(".jar");
 		JarOutputStream jo = new JarOutputStream(new FileOutputStream(temp));
 		for (File file : list) {
-			FileUtils.addFileToJar(jo, file, path + "/" + file.getName());
+			addFileToJar(jo, file, path + "/" + file.getName());
 		}
-		jo.close();
+		close(jo);
 		return temp;
 	}