verify dropwizard application log (#367)

dropwizard/service/src/test/java/org/apache/polaris/service/dropwizard/PolarisApplicationIntegrationTest.java

@@ -33,11 +33,13 @@
 import jakarta.ws.rs.client.Entity;
 import jakarta.ws.rs.client.Invocation;
 import jakarta.ws.rs.core.Response;
+import java.io.File;
 import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.List;
 import java.util.Map;
+import java.util.function.Supplier;
 import org.apache.commons.io.FileUtils;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.iceberg.BaseTable;
@@ -94,6 +96,7 @@
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.TestInfo;
 import org.junit.jupiter.api.extension.ExtendWith;
+import org.junit.jupiter.api.io.TempDir;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.testcontainers.shaded.com.google.common.collect.ImmutableMap;
@@ -105,6 +108,10 @@
   SnowmanCredentialsExtension.class
 })
 public class PolarisApplicationIntegrationTest {
+  @TempDir private static Path tempDir;
+  private static final Supplier<String> CURRENT_LOG =
+      () -> tempDir.resolve("application.log").toString();
+
   private static final Logger LOGGER =
       LoggerFactory.getLogger(PolarisApplicationIntegrationTest.class);
 
@@ -117,7 +124,9 @@ public class PolarisApplicationIntegrationTest {
               "server.applicationConnectors[0].port",
               "0"), // Bind to random port to support parallelism
           ConfigOverride.config(
-              "server.adminConnectors[0].port", "0")); // Bind to random port to support parallelism
+              "server.adminConnectors[0].port", "0"), // Bind to random port to support parallelism
+          ConfigOverride.config("logging.appenders[1].type", "file"),
+          ConfigOverride.config("logging.appenders[1].currentLogFilename", CURRENT_LOG));
 
   private static String userToken;
   private static SnowmanCredentialsExtension.SnowmanCredentials snowmanCredentials;
@@ -132,6 +141,11 @@ public static void setup(
       throws IOException {
     realm = polarisRealm;
 
+    assertThat(new File(CURRENT_LOG.get()))
+        .exists()
+        .content()
+        .contains("PolarisApplication: Server started successfully");
+
     testDir = Path.of("build/test_data/iceberg/" + realm);
     FileUtils.deleteQuietly(testDir.toFile());
     Files.createDirectories(testDir);
@@ -165,6 +179,8 @@ public static void setup(
       assertThat(assignPrResponse)
           .returns(Response.Status.CREATED.getStatusCode(), Response::getStatus);
     }
+
+    assertZeroErrorsInApplicationLog();
   }
 
   @AfterAll
@@ -181,6 +197,14 @@ public static void deletePrincipalRole() {
         .close();
   }
 
+  private static void assertZeroErrorsInApplicationLog() {
+    assertThat(new File(CURRENT_LOG.get()))
+        .exists()
+        .content()
+        .hasSizeGreaterThan(0)
+        .doesNotContain("ERROR", "FATAL");
+  }
+
   /**
    * Create a new catalog for each test case. Assign the snowman catalog-admin principal role the
    * admin role of the new catalog.