Teach Main to check the Java runtime versionv2.1-rc1

To run Gerrit Code Review we require Java 6, because our class
files are compiled against the Java 6 SDK, use methods from it,
and are in the Java 6 bytecode file format.  We cannot run on a
JRE that predates the Java 6 specification.

Rather than giving users who are trying to run us on an outdated
virutal machine an obtuse stack trace like the following:

  Exception in thread "main" java.lang.UnsupportedClassVersionError:
      Bad version number in .class file
	at java.lang.ClassLoader.defineClass1(Native Method)
        ...

we should give them a specific message describing the problem,
and our minimum version requirement.

To get a custom error message we compile our Main springboard class
in Java 1.2 format, against only APIs that are available since Java
1.2, and we check the specification of our runtime to verify it can
support us.  This allows us to execute on a really old JRE and at
least report a descriptive error message.

In order to use Java 6 APIs in GerritLauncher we had to move it
to its own Maven component, where the runtime environment is still
described as Java 6.

Change-Id: I47bfcfb5076427d491c896a2815dd091ca205bfc
Signed-off-by: Shawn O. Pearce <sop@google.com>

16 files changed, 462 insertions, 10 deletions

diff --git a/gerrit-httpd/src/main/java/com/google/gerrit/httpd/UrlModule.java b/gerrit-httpd/src/main/java/com/google/gerrit/httpd/UrlModule.java
index 0e91146075..0467d8690a 100644
--- a/gerrit-httpd/src/main/java/com/google/gerrit/httpd/UrlModule.java
+++ b/gerrit-httpd/src/main/java/com/google/gerrit/httpd/UrlModule.java
@@ -53,7 +53,7 @@ class UrlModule extends ServletModule {
     serve("/static/*").with(StaticServlet.class);
 
     serve("/Main.class").with(notFound());
-    serve("/com/google/gerrit/main/*").with(notFound());
+    serve("/com/google/gerrit/launcher/*").with(notFound());
     serve("/servlet/*").with(notFound());
 
     serve("/all").with(screen(PageLinks.ALL_MERGED));
diff --git a/gerrit-launcher/.gitignore b/gerrit-launcher/.gitignore
new file mode 100644
index 0000000000..903c6c80f5
--- /dev/null
+++ b/gerrit-launcher/.gitignore
@@ -0,0 +1,4 @@
+/target
+/.classpath
+/.project
+/.settings/org.maven.ide.eclipse.prefs
diff --git a/gerrit-launcher/.settings/org.eclipse.core.resources.prefs b/gerrit-launcher/.settings/org.eclipse.core.resources.prefs
new file mode 100644
index 0000000000..82eb859e3b
--- /dev/null
+++ b/gerrit-launcher/.settings/org.eclipse.core.resources.prefs
@@ -0,0 +1,3 @@
+#Tue Sep 02 16:59:24 PDT 2008
+eclipse.preferences.version=1
+encoding/<project>=UTF-8
diff --git a/gerrit-launcher/.settings/org.eclipse.core.runtime.prefs b/gerrit-launcher/.settings/org.eclipse.core.runtime.prefs
new file mode 100644
index 0000000000..8667cfd4a3
--- /dev/null
+++ b/gerrit-launcher/.settings/org.eclipse.core.runtime.prefs
@@ -0,0 +1,3 @@
+#Tue Sep 02 16:59:24 PDT 2008
+eclipse.preferences.version=1
+line.separator=\n
diff --git a/gerrit-launcher/.settings/org.eclipse.jdt.core.prefs b/gerrit-launcher/.settings/org.eclipse.jdt.core.prefs
new file mode 100644
index 0000000000..04afc7fac5
--- /dev/null
+++ b/gerrit-launcher/.settings/org.eclipse.jdt.core.prefs
@@ -0,0 +1,268 @@
+#Tue May 12 17:44:13 PDT 2009
+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.6
+org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
+org.eclipse.jdt.core.compiler.compliance=1.6
+org.eclipse.jdt.core.compiler.debug.lineNumber=generate
+org.eclipse.jdt.core.compiler.debug.localVariable=generate
+org.eclipse.jdt.core.compiler.debug.sourceFile=generate
+org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
+org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
+org.eclipse.jdt.core.compiler.source=1.6
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+org.eclipse.jdt.core.formatter.comment.clear_blank_lines_in_block_comment=false
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+org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_switch=insert
+org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_synchronized=insert
+org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_while=insert
+org.eclipse.jdt.core.formatter.insert_space_before_parenthesized_expression_in_return=insert
+org.eclipse.jdt.core.formatter.insert_space_before_parenthesized_expression_in_throw=insert
+org.eclipse.jdt.core.formatter.insert_space_before_postfix_operator=do not insert
+org.eclipse.jdt.core.formatter.insert_space_before_prefix_operator=do not insert
+org.eclipse.jdt.core.formatter.insert_space_before_question_in_conditional=insert
+org.eclipse.jdt.core.formatter.insert_space_before_question_in_wildcard=do not insert
+org.eclipse.jdt.core.formatter.insert_space_before_semicolon=do not insert
+org.eclipse.jdt.core.formatter.insert_space_before_semicolon_in_for=do not insert
+org.eclipse.jdt.core.formatter.insert_space_before_unary_operator=do not insert
+org.eclipse.jdt.core.formatter.insert_space_between_brackets_in_array_type_reference=do not insert
+org.eclipse.jdt.core.formatter.insert_space_between_empty_braces_in_array_initializer=do not insert
+org.eclipse.jdt.core.formatter.insert_space_between_empty_brackets_in_array_allocation_expression=do not insert
+org.eclipse.jdt.core.formatter.insert_space_between_empty_parens_in_annotation_type_member_declaration=do not insert
+org.eclipse.jdt.core.formatter.insert_space_between_empty_parens_in_constructor_declaration=do not insert
+org.eclipse.jdt.core.formatter.insert_space_between_empty_parens_in_enum_constant=do not insert
+org.eclipse.jdt.core.formatter.insert_space_between_empty_parens_in_method_declaration=do not insert
+org.eclipse.jdt.core.formatter.insert_space_between_empty_parens_in_method_invocation=do not insert
+org.eclipse.jdt.core.formatter.keep_else_statement_on_same_line=false
+org.eclipse.jdt.core.formatter.keep_empty_array_initializer_on_one_line=false
+org.eclipse.jdt.core.formatter.keep_imple_if_on_one_line=true
+org.eclipse.jdt.core.formatter.keep_then_statement_on_same_line=false
+org.eclipse.jdt.core.formatter.lineSplit=80
+org.eclipse.jdt.core.formatter.never_indent_block_comments_on_first_column=false
+org.eclipse.jdt.core.formatter.never_indent_line_comments_on_first_column=false
+org.eclipse.jdt.core.formatter.number_of_blank_lines_at_beginning_of_method_body=0
+org.eclipse.jdt.core.formatter.number_of_empty_lines_to_preserve=3
+org.eclipse.jdt.core.formatter.put_empty_statement_on_new_line=false
+org.eclipse.jdt.core.formatter.tabulation.char=space
+org.eclipse.jdt.core.formatter.tabulation.size=2
+org.eclipse.jdt.core.formatter.use_tabs_only_for_leading_indentations=false
+org.eclipse.jdt.core.formatter.wrap_before_binary_operator=true
diff --git a/gerrit-launcher/.settings/org.eclipse.jdt.ui.prefs b/gerrit-launcher/.settings/org.eclipse.jdt.ui.prefs
new file mode 100644
index 0000000000..d4218a5fc0
--- /dev/null
+++ b/gerrit-launcher/.settings/org.eclipse.jdt.ui.prefs
@@ -0,0 +1,61 @@
+#Wed Jul 29 11:31:38 PDT 2009
+eclipse.preferences.version=1
+editor_save_participant_org.eclipse.jdt.ui.postsavelistener.cleanup=true
+formatter_profile=_Google Format
+formatter_settings_version=11
+org.eclipse.jdt.ui.ignorelowercasenames=true
+org.eclipse.jdt.ui.importorder=com.google;com;junit;net;org;java;javax;
+org.eclipse.jdt.ui.ondemandthreshold=99
+org.eclipse.jdt.ui.staticondemandthreshold=99
+org.eclipse.jdt.ui.text.custom_code_templates=<?xml version\="1.0" encoding\="UTF-8" standalone\="no"?><templates/>
+sp_cleanup.add_default_serial_version_id=true
+sp_cleanup.add_generated_serial_version_id=false
+sp_cleanup.add_missing_annotations=false
+sp_cleanup.add_missing_deprecated_annotations=true
+sp_cleanup.add_missing_methods=false
+sp_cleanup.add_missing_nls_tags=false
+sp_cleanup.add_missing_override_annotations=true
+sp_cleanup.add_serial_version_id=false
+sp_cleanup.always_use_blocks=true
+sp_cleanup.always_use_parentheses_in_expressions=false
+sp_cleanup.always_use_this_for_non_static_field_access=false
+sp_cleanup.always_use_this_for_non_static_method_access=false
+sp_cleanup.convert_to_enhanced_for_loop=false
+sp_cleanup.correct_indentation=false
+sp_cleanup.format_source_code=false
+sp_cleanup.format_source_code_changes_only=false
+sp_cleanup.make_local_variable_final=true
+sp_cleanup.make_parameters_final=true
+sp_cleanup.make_private_fields_final=true
+sp_cleanup.make_type_abstract_if_missing_method=false
+sp_cleanup.make_variable_declarations_final=false
+sp_cleanup.never_use_blocks=false
+sp_cleanup.never_use_parentheses_in_expressions=true
+sp_cleanup.on_save_use_additional_actions=true
+sp_cleanup.organize_imports=false
+sp_cleanup.qualify_static_field_accesses_with_declaring_class=false
+sp_cleanup.qualify_static_member_accesses_through_instances_with_declaring_class=true
+sp_cleanup.qualify_static_member_accesses_through_subtypes_with_declaring_class=true
+sp_cleanup.qualify_static_member_accesses_with_declaring_class=false
+sp_cleanup.qualify_static_method_accesses_with_declaring_class=false
+sp_cleanup.remove_private_constructors=true
+sp_cleanup.remove_trailing_whitespaces=true
+sp_cleanup.remove_trailing_whitespaces_all=true
+sp_cleanup.remove_trailing_whitespaces_ignore_empty=false
+sp_cleanup.remove_unnecessary_casts=false
+sp_cleanup.remove_unnecessary_nls_tags=false
+sp_cleanup.remove_unused_imports=false
+sp_cleanup.remove_unused_local_variables=false
+sp_cleanup.remove_unused_private_fields=true
+sp_cleanup.remove_unused_private_members=false
+sp_cleanup.remove_unused_private_methods=true
+sp_cleanup.remove_unused_private_types=true
+sp_cleanup.sort_members=false
+sp_cleanup.sort_members_all=false
+sp_cleanup.use_blocks=false
+sp_cleanup.use_blocks_only_for_return_and_throw=false
+sp_cleanup.use_parentheses_in_expressions=false
+sp_cleanup.use_this_for_non_static_field_access=false
+sp_cleanup.use_this_for_non_static_field_access_only_if_necessary=true
+sp_cleanup.use_this_for_non_static_method_access=false
+sp_cleanup.use_this_for_non_static_method_access_only_if_necessary=true
diff --git a/gerrit-launcher/pom.xml b/gerrit-launcher/pom.xml
new file mode 100644
index 0000000000..3c9c979618
--- /dev/null
+++ b/gerrit-launcher/pom.xml
@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+Copyright (C) 2009 The Android Open Source Project
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <parent>
+    <groupId>com.google.gerrit</groupId>
+    <artifactId>gerrit-parent</artifactId>
+    <version>2.1-SNAPSHOT</version>
+  </parent>
+
+  <artifactId>gerrit-launcher</artifactId>
+  <name>Gerrit Code Review - Launcher</name>
+
+  <description>
+    Bootstraps the rest of our classpath after Main
+  </description>
+</project>
diff --git a/gerrit-main/src/main/java/com/google/gerrit/main/GerritLauncher.java b/gerrit-launcher/src/main/java/com/google/gerrit/launcher/GerritLauncher.java
index cbc2b4a95a..31dfae7264 100644
--- a/gerrit-main/src/main/java/com/google/gerrit/main/GerritLauncher.java
+++ b/gerrit-launcher/src/main/java/com/google/gerrit/launcher/GerritLauncher.java
@@ -1,4 +1,4 @@
-package com.google.gerrit.main;
+package com.google.gerrit.launcher;
 
 // Copyright (C) 2009 The Android Open Source Project
 //
diff --git a/gerrit-main/pom.xml b/gerrit-main/pom.xml
index 71bfd89a52..57eb32ba21 100644
--- a/gerrit-main/pom.xml
+++ b/gerrit-main/pom.xml
@@ -31,4 +31,42 @@ limitations under the License.
   <description>
     Main class to bootstrap out of a WAR
   </description>
+
+  <dependencies>
+    <dependency>
+      <groupId>com.google.gerrit</groupId>
+      <artifactId>gerrit-launcher</artifactId>
+    </dependency>
+  </dependencies>
+
+  <build>
+    <plugins>
+      <plugin>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <version>2.0.2</version>
+        <configuration>
+          <source>1.2</source>
+          <target>1.2</target>
+          <encoding>UTF-8</encoding>
+        </configuration>
+      </plugin>
+
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-shade-plugin</artifactId>
+        <version>1.2</version>
+        <executions>
+          <execution>
+            <phase>package</phase>
+            <goals>
+              <goal>shade</goal>
+            </goals>
+            <configuration>
+              <createDependencyReducedPom>false</createDependencyReducedPom>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
+    </plugins>
+  </build>
 </project>
diff --git a/gerrit-main/src/main/java/Main.java b/gerrit-main/src/main/java/Main.java
index 087a8e3a64..30a55fb5c8 100644
--- a/gerrit-main/src/main/java/Main.java
+++ b/gerrit-main/src/main/java/Main.java
@@ -16,12 +16,46 @@
 public final class Main {
   // We don't do any real work here because we need to import
   // the archive lookup code and we cannot import a class in
-  // the default package.  So this is just a tiny springboard
+  // the default package. So this is just a tiny springboard
   // to jump into the real main code.
   //
 
   public static void main(final String argv[]) throws Exception {
-    com.google.gerrit.main.GerritLauncher.main(argv);
+    if (onSupportedJavaVersion()) {
+      com.google.gerrit.launcher.GerritLauncher.main(argv);
+
+    } else {
+      System.exit(1);
+    }
+  }
+
+  private static boolean onSupportedJavaVersion() {
+    final String version = System.getProperty("java.specification.version");
+    if (1.6 <= parse(version)) {
+      return true;
+
+    } else {
+      System.err.println("fatal: Gerrit Code Review requires Java 6 or later");
+      System.err.println("       (trying to run on Java " + version + ")");
+      return false;
+    }
+  }
+
+  private static double parse(String version) {
+    if (version == null || version.length() == 0) {
+      return 0.0;
+    }
+
+    try {
+      final int fd = version.indexOf('.');
+      final int sd = version.indexOf('.', fd + 1);
+      if (0 < sd) {
+        version = version.substring(0, sd);
+      }
+      return Double.parseDouble(version);
+    } catch (NumberFormatException e) {
+      return 0.0;
+    }
   }
 
   private Main() {
diff --git a/gerrit-pgm/src/main/java/com/google/gerrit/pgm/Cat.java b/gerrit-pgm/src/main/java/com/google/gerrit/pgm/Cat.java
index f8f943e3a6..da6a42e31b 100644
--- a/gerrit-pgm/src/main/java/com/google/gerrit/pgm/Cat.java
+++ b/gerrit-pgm/src/main/java/com/google/gerrit/pgm/Cat.java
@@ -14,7 +14,7 @@
 
 package com.google.gerrit.pgm;
 
-import com.google.gerrit.main.GerritLauncher;
+import com.google.gerrit.launcher.GerritLauncher;
 import com.google.gerrit.pgm.util.AbstractProgram;
 
 import org.kohsuke.args4j.Argument;
diff --git a/gerrit-pgm/src/main/java/com/google/gerrit/pgm/Ls.java b/gerrit-pgm/src/main/java/com/google/gerrit/pgm/Ls.java
index 09f0f36746..7e7b602889 100644
--- a/gerrit-pgm/src/main/java/com/google/gerrit/pgm/Ls.java
+++ b/gerrit-pgm/src/main/java/com/google/gerrit/pgm/Ls.java
@@ -14,7 +14,7 @@
 
 package com.google.gerrit.pgm;
 
-import com.google.gerrit.main.GerritLauncher;
+import com.google.gerrit.launcher.GerritLauncher;
 import com.google.gerrit.pgm.util.AbstractProgram;
 
 import java.io.IOException;
diff --git a/gerrit-pgm/src/main/java/com/google/gerrit/pgm/http/jetty/JettyServer.java b/gerrit-pgm/src/main/java/com/google/gerrit/pgm/http/jetty/JettyServer.java
index 3613024a28..fdf485f024 100644
--- a/gerrit-pgm/src/main/java/com/google/gerrit/pgm/http/jetty/JettyServer.java
+++ b/gerrit-pgm/src/main/java/com/google/gerrit/pgm/http/jetty/JettyServer.java
@@ -17,8 +17,8 @@ package com.google.gerrit.pgm.http.jetty;
 import static java.util.concurrent.TimeUnit.MILLISECONDS;
 import static java.util.concurrent.TimeUnit.SECONDS;
 
+import com.google.gerrit.launcher.GerritLauncher;
 import com.google.gerrit.lifecycle.LifecycleListener;
-import com.google.gerrit.main.GerritLauncher;
 import com.google.gerrit.server.config.GerritServerConfig;
 import com.google.gerrit.server.config.SitePaths;
 import com.google.inject.Inject;
@@ -364,7 +364,7 @@ public class JettyServer {
         if (ze.isDirectory()) continue;
         if (name.startsWith("WEB-INF/")) continue;
         if (name.startsWith("META-INF/")) continue;
-        if (name.startsWith("com/google/gerrit/main/")) continue;
+        if (name.startsWith("com/google/gerrit/launcher/")) continue;
         if (name.equals("Main.class")) continue;
 
         final File rawtmp = new File(dstwar, name);
diff --git a/gerrit-pgm/src/main/java/com/google/gerrit/pgm/init/InitContainer.java b/gerrit-pgm/src/main/java/com/google/gerrit/pgm/init/InitContainer.java
index 749eda28c6..ef95d87b7f 100644
--- a/gerrit-pgm/src/main/java/com/google/gerrit/pgm/init/InitContainer.java
+++ b/gerrit-pgm/src/main/java/com/google/gerrit/pgm/init/InitContainer.java
@@ -18,7 +18,7 @@ import static com.google.gerrit.pgm.init.InitUtil.copy;
 import static com.google.gerrit.pgm.init.InitUtil.die;
 import static com.google.gerrit.pgm.init.InitUtil.username;
 
-import com.google.gerrit.main.GerritLauncher;
+import com.google.gerrit.launcher.GerritLauncher;
 import com.google.gerrit.pgm.util.ConsoleUI;
 import com.google.gerrit.server.config.SitePaths;
 import com.google.inject.Inject;
diff --git a/gerrit-war/pom.xml b/gerrit-war/pom.xml
index f587fd4300..21164a4936 100644
--- a/gerrit-war/pom.xml
+++ b/gerrit-war/pom.xml
@@ -117,7 +117,7 @@ limitations under the License.
               <type>jar</type>
               <includes>
                 <include>Main.class</include>
-                <include>com/google/gerrit/main/*.class</include>
+                <include>com/google/gerrit/launcher/*.class</include>
               </includes>
             </overlay>
           </overlays>
diff --git a/pom.xml b/pom.xml
index d4930f23f4..ddc68f4bbf 100644
--- a/pom.xml
+++ b/pom.xml
@@ -75,6 +75,7 @@ limitations under the License.
 
     <module>gerrit-common</module>
     <module>gerrit-httpd</module>
+    <module>gerrit-launcher</module>
     <module>gerrit-main</module>
     <module>gerrit-pgm</module>
     <module>gerrit-reviewdb</module>
@@ -403,6 +404,12 @@ limitations under the License.
 
       <dependency>
         <groupId>com.google.gerrit</groupId>
+        <artifactId>gerrit-launcher</artifactId>
+        <version>${project.version}</version>
+      </dependency>
+
+      <dependency>
+        <groupId>com.google.gerrit</groupId>
         <artifactId>gerrit-main</artifactId>
         <version>${project.version}</version>
       </dependency>