Teach Main to check the Java runtime version

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Rather than giving users who are trying to run us on an outdated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>
This commit is contained in:
Shawn O. Pearce 2009-12-18 15:33:35 -08:00
parent d46db64b4c
commit 6ee0554f27
16 changed files with 462 additions and 10 deletions

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@ -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));

4
gerrit-launcher/.gitignore vendored Normal file
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@ -0,0 +1,4 @@
/target
/.classpath
/.project
/.settings/org.maven.ide.eclipse.prefs

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@ -0,0 +1,3 @@
#Tue Sep 02 16:59:24 PDT 2008
eclipse.preferences.version=1
encoding/<project>=UTF-8

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@ -0,0 +1,3 @@
#Tue Sep 02 16:59:24 PDT 2008
eclipse.preferences.version=1
line.separator=\n

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@ -0,0 +1,268 @@
#Tue May 12 17:44:13 PDT 2009
eclipse.preferences.version=1
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org.eclipse.jdt.core.compiler.debug.sourceFile=generate
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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

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@ -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

34
gerrit-launcher/pom.xml Normal file
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@ -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>

View File

@ -1,4 +1,4 @@
package com.google.gerrit.main;
package com.google.gerrit.launcher;
// Copyright (C) 2009 The Android Open Source Project
//

View File

@ -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>

View File

@ -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() {

View File

@ -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;

View File

@ -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;

View File

@ -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);

View File

@ -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;

View File

@ -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>

View File

@ -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>
@ -401,6 +402,12 @@ limitations under the License.
<version>${project.version}</version>
</dependency>
<dependency>
<groupId>com.google.gerrit</groupId>
<artifactId>gerrit-launcher</artifactId>
<version>${project.version}</version>
</dependency>
<dependency>
<groupId>com.google.gerrit</groupId>
<artifactId>gerrit-main</artifactId>