I want to say I have ran into this before I would try increasing your memory in your Tomcat. If that doesn't fix the problem let me know and I can look into it deeper.
Add this JAVA_OPTS="$JAVA_OPTS -Xmx512m" To the the top of catalina.sh Todd [EMAIL PROTECTED] wrote: > Hello, > > I searched around these mail archives for posts about > NullPointerExceptions, but I wasn't able to find a solution to my problem > below. Any advice on how to find a solution would be greatly appreciated. > > Here is the message I receive from XMLDBException.GetMessage() call: > Failed to execute command 'GetResource' on server: > http://localhost:8080/xindice/, message: java.lang.Exception: > java.lang.NullPointerException > > I'm using the following versions: > Xindice: 1.1b4 > Tomcat: 5.0.25 > JVM: 1.4.2_01-b06 > OS: Linux 2.4.18-14 > > Here is the sequence that causes this error: > 1. User updates web form and post to my Servlet > 2. My servlet does a GetResource() to pull the current version of the > XML data. > 3. My servlet updates the XML data. > 4. My servlet does a createResource() and storeResource() to update the > XML data back into Xindice. > 5. ... later user repeats steps 1 to 4. > > Each time the user updates the form to Add/Update/Delete data. About one > in every ten cycles the NullPointException will be thrown when I perform > the GetResource(). I tried having my code sleep for 2 seconds after the > first GetResource() failed and then retry to call, but that only solves > the problem once in awhile. > > My XML data is usually somewhere in the 5 - 200 Kb range. A posting said > a storeResource should take about 3ms/KB, so I thought sleeping for 2 > seconds should have been enough delay for any of my files. > > Thanks for the help, > -Nate > > Here is some code snippets. I create a singleton that owns this class, so > there is only one of these (currently). Therefore EnableDatabase() is > only executed once the first time that object is used. > > > /* > * XindiceGateway.java > * > * Created on August 25, 2004, 9:31 PM > */ > > package org.test.gateways; > > import java.util.Vector; > import org.apache.log4j.Logger; > import org.apache.xindice.client.xmldb.services.CollectionManager; > import org.apache.xindice.xml.dom.DOMParser; > import org.test.commands.DatabaseCommand; > import org.w3c.dom.Node; > > import org.xmldb.api.base.*; > import org.xmldb.api.modules.*; > import org.xmldb.api.*; > > > /** > * > * @author stoddarn > */ > public class XindiceGateway > { > // Log4j Logger > static Logger m_logger = Logger.getLogger(XindiceGateway.class); > > // Static mutex on the database > static String m_databaseMutex = new String ("mutex"); > > private boolean m_databaseRegistered = false; > > // Static XINDICE data > private static String XINDICE_DB_DRIVER = new > String("org.apache.xindice.client.xmldb.DatabaseImpl"); > > // The root to the database > private static String XINDICE_DB_ROOT = new > String("xmldb:xindice://localhost:8080/db/"); // LINUX Penguin > > // Xindice API version > private static String XINDICE_API_VERSION = new String ("1.0"); > > // Xindice file setup > private static String XINDICE_COMPRESSION_ENABLED = new String ("true"); > private static String XINDICE_FILTER_CLASS = new > String("org.apache.xindice.core.filer.BTreeFiler"); > > > /** Make sure the database is registered */ > protected void EnableDatabase () > throws ClassNotFoundException, InstantiationException, > IllegalAccessException, > XMLDBException > { > // If the database isn't already registered > if (! m_databaseRegistered) > { > m_databaseRegistered = true; > > m_logger.info("Enabling Xindice Database"); > > Class c = Class.forName(XINDICE_DB_DRIVER); > > Database database = (Database) c.newInstance(); > DatabaseManager.registerDatabase(database); > > // Update the CodeReview paths > boolean baseCollectionFound = false; > boolean projectListingsCollectionFound = false; > boolean projectListingsFileFound = false; > boolean projectsCollectionFound = false; > > // Check for "test" > String [] baseCollection = ListCollections(""); > // Loop to see if there is a match > for (int bcItr = 0; !baseCollectionFound && bcItr < > baseCollection.length; bcItr++) > { > > if (baseCollection[bcItr].equals("test")) > { > baseCollectionFound = true; > } > } > // If the baseCollection is missing add it > if (!baseCollectionFound) > { > m_logger.info("Create codereview collection required"); > CreateCollection("", "test"); > } > > // Check for "projectlistings" and "projects" > String [] testCollection = ListCollections("test"); > // Loop to see if there is a match for project listings and projects > for (int crItr = 0; (!projectListingsCollectionFound || > !projectsCollectionFound) && crItr < testCollection.length; crItr++) > { > if (testCollection[crItr].equals("projectlistings")) > { > projectListingsCollectionFound = true; > } > else if (testCollection[crItr].equals("projects")) > { > projectsCollectionFound = true; > } > } > // If the baseCollection is missing add it > if (!projectListingsCollectionFound) > { > m_logger.info("Create projectlistings collection required"); > CreateCollection("test", "projectlistings"); > } > > // If the baseCollection is missing add it > if (!projectsCollectionFound) > { > m_logger.info("Create projects collection required"); > CreateCollection("test", "projects"); > } > } > } > > > /** Add documents to a collection */ > public void AddDocument(String collectionName, String documentName, String > documentXML) > { > Collection col = null; > > String[] documents = null; > synchronized (m_databaseMutex) > { > try { > EnableDatabase(); > > // Get the collection > col = DatabaseManager.getCollection(XINDICE_DB_ROOT + collectionName); > > XMLResource document = (XMLResource) > col.createResource(documentName, "XMLResource"); > document.setContent(documentXML); > col.storeResource(document); > } > catch (XMLDBException e) { > m_logger.error("AddDocument: XML:DB Exception occured: " + > e.getMessage()); > } > catch (Exception e) { > m_logger.error("AddDocument: Other Exception occured"); > } > finally > { > // If the colletion was created, then make sure we close it > if (col != null) > { > try > { > // Close the collection > col.close(); > } > catch (Exception e) > { > // Catch any issues with closing the exception. > m_logger.error("Unable to close collection. " + e.getMessage()); > } > } > } > } > } > > > /** Read a document */ > public String ReadDocument(String collectionName, String documentName) > { > Collection col = null; > String returnString = null; > > synchronized (m_databaseMutex) > { > try { > EnableDatabase(); > > col = DatabaseManager.getCollection(XINDICE_DB_ROOT + collectionName); > > XMLResource document = (XMLResource) col.getResource(documentName); > > returnString = (String)document.getContent(); > } > catch (XMLDBException e) { > m_logger.error("ReadDocument (" + collectionName + "/" + > documentName + "): " + e.getMessage()); > } > catch (Exception e) { > m_logger.error("ReadDocument (" + collectionName + "/" + > documentName + "): " + e.getMessage()); > } > finally > { > // If the colletion was created, then make sure we close it > if (col != null) > { > try > { > // Close the collection > col.close(); > } > catch (Exception e) > { > // Catch any issues with closing the exception. > m_logger.error("Unable to close collection. " + e.getMessage()); > } > } > } > } > > return (returnString); > } > > > > /** Creates a new instance of XindiceGateway */ > public XindiceGateway() > { > } > > } >
