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POCopy the current UIMA CAS object
 

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  1. POCopy the current UIMA CAS object
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    <p>I'm working on a project which uses <a href="https://uima.apache.org/" rel="nofollow">Apache UIMA</a> framework to annotate documents. Since I have to pass all the documents once and process them in one for-lopp, so I have to temporarily store (copy) the current CAS object for the current document so as to avoid being messed up by following FSs and heap values.</p> <p>So as is followed, I used CasCopier to firstly copy the current CAS and display that before processing the next document.</p> <pre><code> 1. public class DocumentAnalysis { 2. public DocumentAnalysis(CAS cas) { 3. this.cas = cas; 4. } 5. 6. public processDocuments(Document documents) { 7. for(Document document: documents) { 8. // process each document, after this method, the cas has all values 9. processSingleDoc(document); 10. 11. // create a new CAS as the destination of copy 12. CAS localCas = CASFactory.createCas().getCas(); 13. 14. // copy the current CAS to the new CAS 15. CASCopier.copyCas(this.cas, localCas, true); 16. } 17. } 18. 19. public processSingleDoc(Document document) { 20. // the logic for processing 21. // implement UIMA process() method 22. ...... 23. } 24. 25. CAS cas; 26. } </code></pre> <p>However, the problem is that it threw a NullPointerException at line 12 and I figured that the getCAS() method requires the indexRepository variable and the localCas I created doesn't have that value, which means that the creation of new CAS might be incorrect. </p> <p>I've searched online and haven't found out any solutions yet. So does anyone know how I can copy the current CAS to a newly created CAS?</p> <p>Thanks in advance!!! </p>
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    1. COWhere is `this.cas` instantiated? From this code sample, it is null, and thus the NPE.
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      1. USrmlan
    2. CO@rmlan: Hi, it's my fault that I forgot to provide the constructor of this class. I've edited my post.
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    3. COCan you post the stack trace?
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      1. USrmlan
 

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