diff --git a/playwright/src/test/java/com/microsoft/playwright/TestHar.java b/playwright/src/test/java/com/microsoft/playwright/TestHar.java
index 2dcc0f75..92c3e3fa 100644
--- a/playwright/src/test/java/com/microsoft/playwright/TestHar.java
+++ b/playwright/src/test/java/com/microsoft/playwright/TestHar.java
@@ -47,9 +47,11 @@ public class TestHar extends TestBase {
       page = context.newPage();
     }
 
-    JsonObject log() throws FileNotFoundException {
+    JsonObject log() throws IOException {
       context.close();
-      return new Gson().fromJson(new FileReader(harFile.toFile()), JsonObject.class).getAsJsonObject("log");
+      try (FileReader json = new FileReader(harFile.toFile())) {
+        return new Gson().fromJson(json, JsonObject.class).getAsJsonObject("log");
+      }
     }
 
     void dispose() throws IOException {
@@ -79,7 +81,7 @@ public class TestHar extends TestBase {
   }
 
   @Test
-  void shouldHaveVersionAndCreator() throws FileNotFoundException {
+  void shouldHaveVersionAndCreator() throws IOException {
     pageWithHar.page.navigate(server.EMPTY_PAGE);
     JsonObject log = pageWithHar.log();
     assertEquals("1.2", log.get("version").getAsString());
@@ -87,7 +89,7 @@ public class TestHar extends TestBase {
   }
 
   @Test
-  void shouldHaveBrowser() throws FileNotFoundException {
+  void shouldHaveBrowser() throws IOException {
     pageWithHar.page.navigate(server.EMPTY_PAGE);
     JsonObject log = pageWithHar.log();
     assertEquals(browserType.name(), log.getAsJsonObject("browser").get("name").getAsString().toLowerCase());
@@ -95,7 +97,7 @@ public class TestHar extends TestBase {
   }
 
   @Test
-  void shouldHavePages() throws FileNotFoundException {
+  void shouldHavePages() throws IOException {
     pageWithHar.page.navigate("data:text/html,<title>Hello</title>");
     // For data: load comes before domcontentloaded...
     Deferred<Void> loadEvent = pageWithHar.page.waitForLoadState(Page.LoadState.DOMCONTENTLOADED);
@@ -131,12 +133,10 @@ public class TestHar extends TestBase {
     JsonObject pageEntry = log.getAsJsonArray("pages").get(0).getAsJsonObject();
     assertEquals("page_0", pageEntry.get("id").getAsString());
     assertEquals("Hello", pageEntry.get("title").getAsString());
-
-    Files.deleteIfExists(harPath);
   }
 
   @Test
-  void shouldIncludeRequest() throws FileNotFoundException {
+  void shouldIncludeRequest() throws IOException {
     pageWithHar.page.navigate(server.EMPTY_PAGE);
     JsonObject log = pageWithHar.log();
     assertEquals(1, log.getAsJsonArray("entries").size());
@@ -157,7 +157,7 @@ public class TestHar extends TestBase {
   }
 
   @Test
-  void shouldIncludeResponse() throws FileNotFoundException {
+  void shouldIncludeResponse() throws IOException {
     pageWithHar.page.navigate(server.EMPTY_PAGE);
     JsonObject log = pageWithHar.log();
     JsonObject entry = log.getAsJsonArray("entries").get(0).getAsJsonObject();
diff --git a/playwright/src/test/java/com/microsoft/playwright/TestPageWaitForNavigation.java b/playwright/src/test/java/com/microsoft/playwright/TestPageWaitForNavigation.java
index 5264a0c3..9e2bef45 100644
--- a/playwright/src/test/java/com/microsoft/playwright/TestPageWaitForNavigation.java
+++ b/playwright/src/test/java/com/microsoft/playwright/TestPageWaitForNavigation.java
@@ -69,14 +69,17 @@ public class TestPageWaitForNavigation extends TestBase {
   @Test
   void shouldWorkWithClickingOnLinksWhichDoNotCommitNavigation() throws InterruptedException {
     page.navigate(server.EMPTY_PAGE);
+    Deferred<Response> event = page.waitForNavigation();
     page.setContent("<a href='" + httpsServer.EMPTY_PAGE + "'>foobar</a>");
     try {
-      Deferred<Response> event = page.waitForNavigation();
       page.click("a");
       event.get();
       fail("did not throw");
     } catch (PlaywrightException e) {
-      assertTrue(e.getMessage().contains(expectedSSLError(browserType.name())), e.getMessage());
+      if (!e.getMessage().contains(expectedSSLError(browserType.name()))) {
+        e.printStackTrace(System.err);
+        fail("Unexpected exception: '" + e.getMessage() + "'");
+      }
     }
   }
 
diff --git a/playwright/src/test/java/com/microsoft/playwright/TestWebSocket.java b/playwright/src/test/java/com/microsoft/playwright/TestWebSocket.java
index ba8605b1..a986bd46 100644
--- a/playwright/src/test/java/com/microsoft/playwright/TestWebSocket.java
+++ b/playwright/src/test/java/com/microsoft/playwright/TestWebSocket.java
@@ -140,8 +140,8 @@ public class TestWebSocket extends TestBase {
       "    ws.addEventListener('message', () => { ws.close(); });\n" +
       "  }", webSocketServer.getPort());
     waitForCondition(socketClosed);
-    assertEquals("open", log.get(0));
-    assertEquals("close", log.get(3));
+    assertEquals("open", log.get(0), "Events: " + log);
+    assertEquals("close", log.get(3), "Events: " + log);
     log.sort(String::compareTo);
     assertEquals(asList("close", "open", "received<incoming>", "sent<outgoing>"), log);
   }