[!] WordCount 에러

[root@localhost hadoop-1.0.3]# javac -classpath hadoop-core-1.0.3.jar -d playground/classes playground/src/WordCount.java

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1. ERROR in playground/src/WordCount.java (at line 20)

        extends Mapper<Object, Text, Text, IntWritable>{

                ^^^^^^

The type Mapper is not generic; it cannot be parameterized with arguments <Object, Text, Text, IntWritable>

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2. ERROR in playground/src/WordCount.java (at line 20)

        extends Mapper<Object, Text, Text, IntWritable>{

                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Syntax error, parameterized types are only available if source level is 5.0

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3. ERROR in playground/src/WordCount.java (at line 25)

        public void map(Object key, Text value, Context context

                                                ^^^^^^^

Context cannot be resolved to a type

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4. ERROR in playground/src/WordCount.java (at line 36)

        extends Reducer<Text,IntWritable,Text,IntWritable> {

                ^^^^^^^

The type Reducer is not generic; it cannot be parameterized with arguments <Text, IntWritable, Text, IntWritable>

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5. ERROR in playground/src/WordCount.java (at line 36)

        extends Reducer<Text,IntWritable,Text,IntWritable> {

                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Syntax error, parameterized types are only available if source level is 5.0

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6. ERROR in playground/src/WordCount.java (at line 39)

        public void reduce(Text key, Iterable<IntWritable> values,

                                     ^^^^^^^^

The type Iterable is not generic; it cannot be parameterized with arguments <Int Writable>

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7. ERROR in playground/src/WordCount.java (at line 39)

        public void reduce(Text key, Iterable<IntWritable> values,

                                              ^^^^^^^^^^^

Syntax error, parameterized types are only available if source level is 5.0

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8. ERROR in playground/src/WordCount.java (at line 40)

        Context context

        ^^^^^^^

Context cannot be resolved to a type

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9. ERROR in playground/src/WordCount.java (at line 43)

        for (IntWritable val : values) {

             ^^^^^^^^^^^^^^^^^^^^^^^^

Syntax error, 'for each' statements are only available if source level is 5.0

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10. ERROR in playground/src/WordCount.java (at line 53)

        String[] otherArgs = new GenericOptionsParser(conf, args).getRemainingArgs();

                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

The type org.apache.commons.cli.Options cannot be resolved. It is indirectly referenced from required .class files

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10 problems (10 errors)

도대체 이 에러들은 무엇이란 말인가.... 몇시간 째 삽질을 하고 있는 거냐구..ㅠㅠ

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이것에 대한 해답은 바로 JDK를 제대로 설치하지 못한 기본기 부족함에서 나왔다..

반성하자!!