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使用 Ubuntu 12.04LTS 和

java version "1.6.0_27"
OpenJDK Runtime Environment (IcedTea6 1.12.6) (6b27-1.12.6-1ubuntu0.12.04.2)
OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode)

构建源代码时出现以下错误。JAVA_HOME=/usr/lib/jvm/java-6-openjdk-amd64

我所做的是：

svn co http://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk/
cd trunk
ant

构建表示成功，但显示以下错误：

ompile-java6:
    [javac] Compiling 1313 source files to /root/trunk/output/classes
    [javac] /root/trunk/java/javax/el/ResourceBundleELResolver.java:109: warning: getFeatureDescriptors(javax.el.ELContext,java.lang.Object) in javax.el.ResourceBundleELResolver overrides getFeatureDescriptors(javax.el.ELContext,java.lang.Object) in javax.el.ELResolver; return type requires unchecked conversion
    [javac] found   : java.util.Iterator
    [javac] required: java.util.Iterator<java.beans.FeatureDescriptor>
    [javac]     public Iterator getFeatureDescriptors(
    [javac]                     ^
    [javac] Note: Some input files use or override a deprecated API.
    [javac] Note: Recompile with -Xlint:deprecation for details.
    [javac] 1 warning

我该如何解决这个警告？

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