vaadin · caalador · Dec 14, 2021 · Dec 2, 2021 · Dec 3, 2021 · Dec 8, 2021
diff --git a/flow-server/src/main/java/com/vaadin/experimental/FeatureFlags.java b/flow-server/src/main/java/com/vaadin/experimental/FeatureFlags.java
@@ -152,8 +152,9 @@ void loadProperties() {
                     .getApplicationResource(PROPERTIES_FILENAME);
             if (applicationResource != null) {
                 getLogger().debug("Properties loaded from classpath.");
-                try {
-                    loadProperties(applicationResource.openStream());
+                try (InputStream propertiesStream = applicationResource
+                        .openStream()) {
+                    loadProperties(propertiesStream);
                     return;
                 } catch (IOException e) {
                     throw new UncheckedIOException(

diff --git a/flow-server/src/main/java/com/vaadin/flow/server/communication/StreamReceiverHandler.java b/flow-server/src/main/java/com/vaadin/flow/server/communication/StreamReceiverHandler.java
@@ -26,6 +26,7 @@
 import java.io.OutputStreamWriter;
 import java.io.PrintWriter;
 import java.io.Serializable;
+import java.io.UncheckedIOException;
 import java.nio.charset.StandardCharsets;
 import java.security.MessageDigest;
 import java.util.Collection;
@@ -379,11 +380,11 @@ protected boolean handleFileUploadValidationAndData(VaadinSession session,
         } finally {
             session.unlock();
         }
-        try {
+        try (InputStream handledStream = inputStream) {
             // Store ui reference so we can do cleanup even if node is
             // detached in some event handler
             Pair<Boolean, UploadStatus> result = streamToReceiver(session,
-                    inputStream, streamReceiver, filename, mimeType,
+                    handledStream, streamReceiver, filename, mimeType,
                     contentLength);
             if (result.getFirst()) {
                 cleanStreamVariable(session, streamReceiver);

diff --git a/flow-server/src/main/java/com/vaadin/flow/server/frontend/FrontendUtils.java b/flow-server/src/main/java/com/vaadin/flow/server/frontend/FrontendUtils.java
@@ -383,8 +383,8 @@ public static boolean isWindows() {
      */
     public static String streamToString(InputStream inputStream) {
         String ret = "";
-        try {
-            return IOUtils.toString(inputStream, StandardCharsets.UTF_8)
+        try (InputStream handledStream = inputStream) {
+            return IOUtils.toString(handledStream, StandardCharsets.UTF_8)
                     .replaceAll("\\R", System.lineSeparator());
         } catch (IOException exception) {
             // ignore exception on close()
@@ -598,18 +598,17 @@ private static InputStream getStatsFromClassPath(VaadinService service) {
                 .getAttribute(Lookup.class).lookup(ResourceProvider.class);
         URL statsUrl = resourceProvider.getApplicationResource(stats);
         InputStream stream = null;
-        try {
-            stream = statsUrl == null ? null : statsUrl.openStream();
-            if (stream != null) {
-                byte[] buffer = IOUtils.toByteArray(stream);
+        if (statsUrl != null) {
+            try (InputStream statsStream = statsUrl.openStream()) {
+                byte[] buffer = IOUtils.toByteArray(statsStream);
                 statistics = new Stats(buffer, null);
                 service.getContext().setAttribute(statistics);
                 stream = new ByteArrayInputStream(buffer);
+            } catch (IOException exception) {
+                getLogger().warn("Couldn't read content of stats file {}",
+                        stats, exception);
+                stream = null;
             }
-        } catch (IOException exception) {
-            getLogger().warn("Couldn't read content of stats file {}", stats,
-                    exception);
-            stream = null;
         }
         if (stream == null) {
             getLogger().error(

diff --git a/flow-server/src/main/java/com/vaadin/flow/server/frontend/TaskGenerateIndexHtml.java b/flow-server/src/main/java/com/vaadin/flow/server/frontend/TaskGenerateIndexHtml.java
@@ -17,6 +17,7 @@
 
 import java.io.File;
 import java.io.IOException;
+import java.io.InputStream;
 
 import org.apache.commons.io.IOUtils;
 
@@ -49,8 +50,10 @@ public class TaskGenerateIndexHtml extends AbstractTaskClientGenerator {
 
     @Override
     protected String getFileContent() throws IOException {
-        return IOUtils.toString(getClass().getResourceAsStream(INDEX_HTML),
-                UTF_8);
+        try (InputStream indexStream = getClass()
+                .getResourceAsStream(INDEX_HTML)) {
+            return IOUtils.toString(indexStream, UTF_8);
+        }
     }
 
     @Override

diff --git a/flow-server/src/main/java/com/vaadin/flow/server/frontend/TaskGenerateIndexTs.java b/flow-server/src/main/java/com/vaadin/flow/server/frontend/TaskGenerateIndexTs.java
@@ -17,6 +17,7 @@
 
 import java.io.File;
 import java.io.IOException;
+import java.io.InputStream;
 
 import org.apache.commons.io.IOUtils;
 
@@ -76,8 +77,11 @@ protected boolean shouldGenerate() {
 
     @Override
     protected String getFileContent() throws IOException {
-        String indexTemplate = IOUtils
-                .toString(getClass().getResourceAsStream(INDEX_TS), UTF_8);
+        String indexTemplate;
+        try (InputStream indexTsStream = getClass()
+                .getResourceAsStream(INDEX_TS)) {
+            indexTemplate = IOUtils.toString(indexTsStream, UTF_8);
+        }
         String relativizedImport = ensureValidRelativePath(
                 FrontendUtils.getUnixRelativePath(buildDirectory.toPath(),
                         generatedImports.toPath()));

diff --git a/flow-server/src/main/java/com/vaadin/flow/server/frontend/TaskGenerateServiceWorker.java b/flow-server/src/main/java/com/vaadin/flow/server/frontend/TaskGenerateServiceWorker.java
@@ -17,6 +17,7 @@
 
 import java.io.File;
 import java.io.IOException;
+import java.io.InputStream;
 
 import org.apache.commons.io.IOUtils;
 
@@ -52,8 +53,10 @@ public class TaskGenerateServiceWorker extends AbstractTaskClientGenerator {
 
     @Override
     protected String getFileContent() throws IOException {
-        return IOUtils.toString(
-                getClass().getResourceAsStream(SERVICE_WORKER_SRC), UTF_8);
+        try (InputStream swStream = getClass()
+                .getResourceAsStream(SERVICE_WORKER_SRC)) {
+            return IOUtils.toString(swStream, UTF_8);
+        }
     }
 
     @Override

diff --git a/flow-server/src/main/java/com/vaadin/flow/server/frontend/TaskGenerateTsConfig.java b/flow-server/src/main/java/com/vaadin/flow/server/frontend/TaskGenerateTsConfig.java
@@ -17,6 +17,7 @@
 
 import java.io.File;
 import java.io.IOException;
+import java.io.InputStream;
 
 import org.apache.commons.io.IOUtils;
 
@@ -46,8 +47,10 @@ public class TaskGenerateTsConfig extends AbstractTaskClientGenerator {
 
     @Override
     protected String getFileContent() throws IOException {
-        return IOUtils.toString(getClass().getResourceAsStream(TSCONFIG_JSON),
-                UTF_8);
+        try (InputStream tsConfStream = getClass()
+                .getResourceAsStream(TSCONFIG_JSON)) {
+            return IOUtils.toString(tsConfStream, UTF_8);
+        }
     }
 
     @Override

diff --git a/flow-server/src/main/java/com/vaadin/flow/server/frontend/TaskGenerateTsDefinitions.java b/flow-server/src/main/java/com/vaadin/flow/server/frontend/TaskGenerateTsDefinitions.java
@@ -17,6 +17,7 @@
 
 import java.io.File;
 import java.io.IOException;
+import java.io.InputStream;
 
 import org.apache.commons.io.IOUtils;
 
@@ -47,8 +48,10 @@ public class TaskGenerateTsDefinitions extends AbstractTaskClientGenerator {
 
     @Override
     protected String getFileContent() throws IOException {
-        return IOUtils.toString(getClass().getResourceAsStream(TS_DEFINITIONS),
-                UTF_8);
+        try (InputStream tsDefinitionStream = getClass()
+                .getResourceAsStream(TS_DEFINITIONS)) {
+            return IOUtils.toString(tsDefinitionStream, UTF_8);
+        }
     }
 
     @Override

diff --git a/flow-server/src/main/java/com/vaadin/flow/server/frontend/TaskGenerateViteDevMode.java b/flow-server/src/main/java/com/vaadin/flow/server/frontend/TaskGenerateViteDevMode.java
@@ -19,6 +19,7 @@
 
 import java.io.File;
 import java.io.IOException;
+import java.io.InputStream;
 
 import org.apache.commons.io.IOUtils;
 
@@ -63,9 +64,10 @@ protected boolean shouldGenerate() {
 
     @Override
     protected String getFileContent() throws IOException {
-        return IOUtils.toString(
-                getClass().getResourceAsStream(FrontendUtils.VITE_DEVMODE_TS),
-                UTF_8);
+        try (InputStream devModeStream = getClass()
+                .getResourceAsStream(FrontendUtils.VITE_DEVMODE_TS)) {
+            return IOUtils.toString(devModeStream, UTF_8);
+        }
     }
 
 }
diff --git a/flow-server/src/main/java/com/vaadin/flow/server/webcomponent/WebComponentGenerator.java b/flow-server/src/main/java/com/vaadin/flow/server/webcomponent/WebComponentGenerator.java
@@ -16,6 +16,7 @@
 package com.vaadin.flow.server.webcomponent;
 
 import java.io.IOException;
+import java.io.InputStream;
 import java.io.Serializable;
 import java.nio.charset.StandardCharsets;
 import java.util.HashMap;
@@ -61,10 +62,9 @@ private WebComponentGenerator() {
     }
 
     private static String getStringResource(String name) {
-        try {
-            return IOUtils.toString(
-                    WebComponentGenerator.class.getResourceAsStream(name),
-                    StandardCharsets.UTF_8);
+        try (InputStream resourceStream = WebComponentGenerator.class
+                .getResourceAsStream(name)) {
+            return IOUtils.toString(resourceStream, StandardCharsets.UTF_8);
         } catch (IOException e) {
             throw new IllegalArgumentException(
                     "Couldn't load string resource '" + name + "'!", e);