You can use Carrot2 Java API to fetch documents various sources (public search engines, Lucene, Solr), perform clustering, serialize the results to JSON or XML and many more. Below is some example code for the most common use cases. Please see the examples/ directory in the Java API distribution archive for more examples.

carrot2-java-api-3.12.0-SNAPSHOT
................................\examples
................................\........\ambient
................................\........\odp239
................................\........\org
................................\........\...\carrot2
................................\........\...\.......\examples
................................\........\...\.......\........\clustering
................................\........\...\.......\........\core
................................\........\...\.......\........\research
................................\........\...\.......\........\source
................................\lib
................................\...\optional
................................\...\required
................................\resources
................................\suites
................................\build.xml
................................\carrot2.CONTRIBUTORS
................................\carrot2.LICENSE
................................\examples\ambient\ReadMe.txt
................................\........\.......\STRel.txt
................................\........\.......\results.txt
................................\........\.......\subTopics.txt
................................\........\.......\topics.txt
................................\........\log4j.xml
................................\........\odp239\ReadMe.txt
................................\........\......\STRel.txt
................................\........\......\results.txt
................................\........\......\subTopics.txt
................................\........\......\topics.txt
................................\........\.rg\carrot2\examples\ConsoleFormatter.java
................................\........\...\.......\........\CreateLuceneIndex.java
................................\........\...\.......\........\SampleDocumentData.java
................................\........\...\.......\........\clustering\BingKeyAccess.java
................................\........\...\.......\........\..........\ClusteringDataFromDocumentSources.java
................................\........\...\.......\........\..........\ClusteringDataFromLucene.java
................................\........\...\.......\........\..........\ClusteringDataFromLuceneWithCustomFields.java
................................\........\...\.......\........\..........\ClusteringDataFromPubMed.java
................................\........\...\.......\........\..........\ClusteringDocumentList.java
................................\........\...\.......\........\..........\ClusteringNonEnglishContent.java
................................\........\...\.......\........\..........\MoreConfigurationsOfOneAlgorithmInCachingController.java
................................\........\...\.......\........\..........\UsingAttributes.java
................................\........\...\.......\........\..........\UsingCachingController.java
................................\........\...\.......\........\..........\UsingComponentSuites.java
................................\........\...\.......\........\..........\UsingCustomLanguageModel.java
................................\........\...\.......\........\..........\UsingCustomLexicalResources.java
................................\........\...\.......\........\.ore\LoadingAttributeValuesFromXml.java
................................\........\...\.......\........\....\SavingAttributeValuesToXml.java
................................\........\...\.......\........\....\SavingResultsToJson.java
................................\........\...\.......\........\....\SavingResultsToXml.java
................................\........\...\.......\........\....\algorithm-lingo-attributes.xml
................................\........\...\.......\........\research\ClusteringQualityBenchmark.java
................................\........\...\.......\........\source\ByFirstTitleLetterClusteringAlgorithm.java
................................\........\...\.......\........\......\ExampleCustomComponents.java
.......

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