【发布时间】：2015-08-20 10:15:18
【问题描述】：
我当前的项目使用 jdk1.6.0_32、apache-ant-1.7.1 和 CVS 进行代码构建。
现在我们正在迁移到 jdk1.7.0_79。所以我修改了 JAVA_HOME 和用于构建代码的属性文件。
之后，当我尝试执行构建代码时，遇到以下错误。
[javac] warning: java\util\HashMap.class(java\util:HashMap.class): major version 51 is newer than 50, the highest major version supported by this compiler.
[javac] It is recommended that the compiler be upgraded.
[javac] warning: java\lang\Object.class(java\lang:Object.class): major version 51 is newer than 50, the highest major version supported by this compiler.
[javac] It is recommended that the compiler be upgraded.
[javac] warning: java\lang\String.class(java\lang:String.class): major version 51 is newer than 50, the highest major version supported by this compiler.
[javac] It is recommended that the compiler be upgraded.
[javac] warning: java\io\Serializable.class(java\io:Serializable.class): major version 51 is newer than 50, the highest major version supported by this compiler.
[javac] It is recommended that the compiler be upgraded.
[javac] warning: java\util\ArrayList.class(java\util:ArrayList.class): major version 51 is newer than 50, the highest major version supported by this compiler.
[javac] It is recommended that the compiler be upgraded.
[javac] warning: java\util\Iterator.class(java\util:Iterator.class): major version 51 is newer than 50, the highest major version supported by this compiler.
[javac] It is recommended that the compiler be upgraded.
[javac] warning: java\util\Set.class(java\util:Set.class): major version 51 is newer than 50, the highest major version supported by this compiler.
[javac] It is recommended that the compiler be upgraded.
[javac] warning: java\util\List.class(java\util:List.class): major version 51 is newer than 50, the highest major version supported by this compiler.
[javac] It is recommended that the compiler be upgraded.
[javac] warning: java\util\Date.class(java\util:Date.class): major version 51 is newer than 50, the highest major version supported by this compiler.
[javac] It is recommended that the compiler be upgraded.
[javac] warning: java\net\InetAddress.class(java\net:InetAddress.class): major version 51 is newer than 50, the highest major version supported by this compiler.
[javac] It is recommended that the compiler be upgraded.
[javac] warning: java\sql\Connection.class(java\sql:Connection.class): major version 51 is newer than 50, the highest major version supported by this compiler.
[javac] It is recommended that the compiler be upgraded.
[javac] warning: java\sql\PreparedStatement.class(java\sql:PreparedStatement.class): major version 51 is newer than 50, the highest major version supported by this compiler.
[javac] It is recommended that the compiler be upgraded.
[javac] warning: java\sql\ResultSet.class(java\sql:ResultSet.class): major version 51 is newer than 50, the highest major version supported by this compiler.
[javac] It is recommended that the compiler be upgraded.
[javac] warning: java\sql\ResultSetMetaData.class(java\sql:ResultSetMetaData.class): major version 51 is newer than 50, the highest major version supported by this compiler.
[javac] 建议升级编译器。
谁能帮我解决这个问题。
【问题讨论】：