fix: handle nested jar class path fallback

Fixes apolloconfig/apollo#5592

Author: nobodyiam

CHANGES.md

@@ -6,7 +6,7 @@ Apollo Java 2.6.0
 
 ------------------
 
-* 
+* [Fix Apollo client local cache fallback for Spring Boot 3 executable JARs](https://github.com/apolloconfig/apollo-java/pull/136)
 
 ------------------
 All issues and pull requests are [here](https://github.com/apolloconfig/apollo-java/milestone/6?closed=1)

apollo-client-config-data/src/test/java/com/ctrip/framework/apollo/config/data/integration/ConfigDataIntegrationTest.java

@@ -32,9 +32,11 @@
 import com.ctrip.framework.apollo.spi.ConfigFactoryManager;
 import com.ctrip.framework.apollo.spi.ConfigRegistry;
 import com.ctrip.framework.apollo.spring.annotation.ApolloConfigChangeListener;
+import com.ctrip.framework.apollo.spring.boot.ApolloApplicationContextInitializer;
 import com.google.common.collect.Table;
 import java.lang.reflect.Field;
 import java.lang.reflect.Method;
+import java.util.HashMap;
 import java.util.Map;
 import java.util.concurrent.ArrayBlockingQueue;
 import java.util.concurrent.BlockingQueue;
@@ -80,13 +82,14 @@ public class ConfigDataIntegrationTest {
   private static final EmbeddedApollo embeddedApollo = new EmbeddedApollo();
 
   private static final ExternalResource apolloStateResource = new ExternalResource() {
-    private String originalAppId;
     private String originalEnv;
+    private Map<String, String> originalApolloSystemProperties = new HashMap<>();
 
     @Override
     protected void before() throws Throwable {
-      originalAppId = System.getProperty("app.id");
+      originalApolloSystemProperties = snapshotApolloSystemProperties();
       originalEnv = System.getProperty("env");
+      clearApolloSystemProperties();
       System.setProperty("app.id", TEST_APP_ID);
       System.setProperty("env", TEST_ENV);
       resetApolloStaticState();
@@ -99,7 +102,7 @@ protected void after() {
       } catch (Exception ex) {
         throw new RuntimeException(ex);
       } finally {
-        restoreOrClear("app.id", originalAppId);
+        restoreApolloSystemProperties(originalApolloSystemProperties);
         restoreOrClear("env", originalEnv);
       }
     }
@@ -118,6 +121,9 @@ public void beforeEach() {
   @After
   public void afterEach() throws Exception {
     resetApolloStaticState();
+    clearApolloSystemProperties();
+    System.setProperty("app.id", TEST_APP_ID);
+    System.setProperty("env", TEST_ENV);
   }
 
   @Autowired
@@ -283,6 +289,27 @@ private static void restoreOrClear(String key, String originalValue) {
     System.setProperty(key, originalValue);
   }
 
+  private static Map<String, String> snapshotApolloSystemProperties() {
+    Map<String, String> originalProperties = new HashMap<>();
+    for (String propertyName : ApolloApplicationContextInitializer.APOLLO_SYSTEM_PROPERTIES) {
+      originalProperties.put(propertyName, System.getProperty(propertyName));
+    }
+    return originalProperties;
+  }
+
+  private static void clearApolloSystemProperties() {
+    for (String propertyName : ApolloApplicationContextInitializer.APOLLO_SYSTEM_PROPERTIES) {
+      System.clearProperty(propertyName);
+    }
+  }
+
+  private static void restoreApolloSystemProperties(Map<String, String> originalProperties) {
+    clearApolloSystemProperties();
+    for (Map.Entry<String, String> entry : originalProperties.entrySet()) {
+      restoreOrClear(entry.getKey(), entry.getValue());
+    }
+  }
+
   private static void addOrModifyForAllAppIds(String namespace, String key, String value) {
     embeddedApollo.addOrModifyProperty(TEST_APP_ID, namespace, key, value);
     embeddedApollo.addOrModifyProperty(

apollo-core/src/main/java/com/ctrip/framework/apollo/core/utils/ClassLoaderUtil.java

@@ -17,10 +17,8 @@
 package com.ctrip.framework.apollo.core.utils;
 
 import com.google.common.base.Strings;
-
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
-
 import java.net.URL;
 import java.net.URLDecoder;
 
@@ -40,19 +38,12 @@ public class ClassLoaderUtil {
     }
 
     try {
-      URL url = loader.getResource("");
-      // get class path
-      if (url != null) {
-        classPath = url.getPath();
-        classPath = URLDecoder.decode(classPath, "utf-8");
-      }
-
-      // 如果是jar包内的，则返回当前路径
-      if (Strings.isNullOrEmpty(classPath) || classPath.contains(".jar!")) {
-        classPath = System.getProperty("user.dir");
+      classPath = resolveClassPath(loader, null);
+      if (Strings.isNullOrEmpty(classPath)) {
+        classPath = getDefaultClassPath();
       }
     } catch (Throwable ex) {
-      classPath = System.getProperty("user.dir");
+      classPath = getDefaultClassPath();
       logger.warn("Failed to locate class path, fallback to user.dir: {}", classPath, ex);
     }
   }
@@ -65,6 +56,23 @@ public static String getClassPath() {
     return classPath;
   }
 
+  static String resolveClassPath(ClassLoader classLoader, String defaultClassPath) throws Exception {
+    URL url = classLoader.getResource("");
+    if (url == null || !"file".equalsIgnoreCase(url.getProtocol())) {
+      return defaultClassPath;
+    }
+
+    String resolvedClassPath = URLDecoder.decode(url.getPath(), "utf-8");
+    if (Strings.isNullOrEmpty(resolvedClassPath)) {
+      return defaultClassPath;
+    }
+    return resolvedClassPath;
+  }
+
+  private static String getDefaultClassPath() {
+    return System.getProperty("user.dir");
+  }
+
   public static boolean isClassPresent(String className) {
     try {
       Class.forName(className);

apollo-core/src/test/java/com/ctrip/framework/apollo/core/utils/ClassLoaderUtilTest.java

@@ -18,15 +18,53 @@
 
 import static org.junit.Assert.*;
 
+import java.net.URL;
+import java.net.URLDecoder;
+import java.net.URLConnection;
+import java.net.URLStreamHandler;
+import java.nio.file.Files;
+import java.nio.file.Path;
 import org.junit.Test;
 
 public class ClassLoaderUtilTest {
   private static boolean shouldFailInInitialization = false;
+
   @Test
   public void testGetClassLoader() {
     assertNotNull(ClassLoaderUtil.getLoader());
   }
 
+  @Test
+  public void testResolveClassPathWithFileUrl() throws Exception {
+    Path tempDir = Files.createTempDirectory("apollo class path");
+    try {
+      ClassLoader classLoader = classLoaderReturning(tempDir.toUri().toURL());
+
+      assertEquals(URLDecoder.decode(tempDir.toUri().toURL().getPath(), "utf-8"),
+          ClassLoaderUtil.resolveClassPath(classLoader, "fallback"));
+    } finally {
+      Files.deleteIfExists(tempDir);
+    }
+  }
+
+  @Test
+  public void testResolveClassPathFallsBackForNestedJarUrl() throws Exception {
+    String fallback = "/tmp/fallback";
+    URL nestedJarUrl = createUrl("jar:nested:/tmp/apollo-app.jar/!BOOT-INF/classes/!/");
+    ClassLoader classLoader = classLoaderReturning(nestedJarUrl);
+
+    assertEquals(fallback, ClassLoaderUtil.resolveClassPath(classLoader, fallback));
+  }
+
+  @Test
+  public void testResolveClassPathPreservesWindowsStyleFileUrlFormat() throws Exception {
+    URL windowsFileUrl = new URL("file:/C:/Program%20Files/apollo/classes/");
+    ClassLoader classLoader = classLoaderReturning(windowsFileUrl);
+
+    assertEquals("/C:/Program Files/apollo/classes/",
+        ClassLoaderUtil.resolveClassPath(classLoader, "fallback"));
+  }
+
   @Test
   public void testIsClassPresent() {
     assertTrue(ClassLoaderUtil.isClassPresent("java.lang.String"));
@@ -50,4 +88,22 @@ public static class ClassWithInitializationError {
       }
     }
   }
-}
+
+  private ClassLoader classLoaderReturning(URL resource) {
+    return new ClassLoader(null) {
+      @Override
+      public URL getResource(String name) {
+        return resource;
+      }
+    };
+  }
+
+  private URL createUrl(String spec) throws Exception {
+    return new URL(null, spec, new URLStreamHandler() {
+      @Override
+      protected URLConnection openConnection(URL url) {
+        throw new UnsupportedOperationException();
+      }
+    });
+  }
+}