I am getting an error:
java.lang.NullPointerException
When I call:
<cfdump var="#posts#" top="2">
<cfset postsQuery = EntityToQuery(posts)>
dumping posts shows an array of objects as it should but for some reason the EntityToQuery(posts) is breaking. The error message is not one of the normal ones which tell you what line it broke on etc. its just the following struct:
message: [empty string]
StackTrace: java.lang.NullPointerException
TagContext: array[empty]
Type: java.lang.NullPointerException
Does anyone have any idea what could cause this? I think its data related but I don't know what to look for. Its only happening on one implementation of this code, not the others im working on.
Strange errors stopped the next time the coldfusion service was restarted.
So if anyone else has that problem.... give restarting cf a try
Related
I'm Kind new in Cloudsim and CloudReports Extension so i don't know why
when running the CloudReports simulator it gives this Error:
nullpointerexception at org.cloudbus.cloudsim.power.powerdatacenter.processcloudletsubmit(powerdatacenter.java:269)
I was adding a cloudlet scheduling Algorithm to the Extension
All I can see that the error happens with cloudlets Migration.
I tried searching alot about how to Fix it but didn't find something that will help me.
the Error is like this:
java.lang.NullPointerException
at org.cloudbus.cloudsim.Datacenter.processCloudletSubmit(Datacenter.java:761)
at org.cloudbus.cloudsim.power.PowerDatacenter.processCloudletSubmit(PowerDatacenter.java:269)
at org.cloudbus.cloudsim.Datacenter.processEvent(Datacenter.java:159)
at org.cloudbus.cloudsim.core.SimEntity.run(SimEntity.java:406)
at org.cloudbus.cloudsim.core.CloudSim.runClockTick(CloudSim.java:471)
at org.cloudbus.cloudsim.core.CloudSim.run(CloudSim.java:835)
at org.cloudbus.cloudsim.core.CloudSim.startSimulation(CloudSim.java:151)
at cloudreports.simulation.Simulation.runSimulation(Simulation.java:157)
at cloudreports.simulation.Simulation.runAllSimulations(Simulation.java:129)
at cloudreports.simulation.Simulation.run(Simulation.java:98)
at java.lang.Thread.run(Thread.java:748)
plz Advise;
Regards.
I ran into the same problem while I was following the simulation examples provided in the CloudSim project. After debugging figured out that the problem was with setting the UserID of the created cloudlet. I was setting a random value as the userId while the simulation retrieves the cloudlet using the brokerId. So setting the userId with the brokerId that was created did the trick for me.
// dataCenterBroker is the instance of the broker which you created
int brokerId = dataCenterBroker.getId();
//setting the userId after creating the cloudlet
cloudLet.setUserId(brokerId)
I am now trying to dig into struts framework and now, I am testing nested-tags. I encounter problem when I retrieve data. My code is as following :
<nested:select property="formatDisponible">
<logic:iterate id="listFormat" property="formatList" name="videoGameForm">
<html:option value="${listFormat}" />
</logic:iterate>
</nested:select>
When I perform validation action (by that I mean retrieving data from my form) I got the following exception:
GRAVE: Method invocation failed.
java.lang.IllegalArgumentException: java.lang.ClassCastException#110e3b5
at sun.reflect.GeneratedMethodAccessor80.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
Thank you for your help (I will update you about any change).
I finally found what was going wrong in my previous code. If somehow, other people are facing the same problem, I am going to put the correct code below.
<nested:nest property="formatDisponible">
<nested:select property="id">
<html:options collection="formatList" property="id" labelProperty="nom" labelName="id"></html:options>
</nested:select>
</nested:nest>
I corrected my first test and ended up with that solution. The only thing I am trying to figure out right now is how to set selected value (because I am using this form to update my object). If I can resolve it, I will update my post.
All my problem related to this question was solved (at least for now). I accidentally overloaded the value of the select property.
I use the following code to scan for all available WiFi-Networks:
[[CWInterface interface] scanForNetworksWithSSID:nil error:&err];
Usually I get a NSSet of Networks but sometimes I get the following error:
The operation couldn’t be completed. (com.apple.coreWLAN.error error
22.)
Error Domain=com.apple.coreWLAN.error Code=22
I haven't find anything about that error code 22. Is there a documentation or a solution for this?
Because I had another problem with CoreWlan(http://stackoverflow.com/questions/9943833/cwinterface-returning-no-data) i replaced it with Apple80211.framework.
This also is a workaround for this one...
I'm trying to export the entire contents of my database, an HSQLDB, to XML using DBUnit, and I'm getting null pointer errors that I can't understand. I'm following the example in the FAQ:
IDatabaseConnection xmlConnection = new DatabaseConnection(conn);
IDataSet allTables = xmlConnection.createDataSet();
XmlDataSet.write(allTables, new FileOutputStream(DATABASE_PATH + ".xml"));
The null pointer error occurs on the last line. conn and DATABASE_PATH aren't null as they're both checked for that and used later in the program without a problem (exporting the database into CSV using OpenCSV, which works perfectly and exactly as expected).
The stacktrace is as follows:
org.dbunit.dataset.DataSetException: java.sql.SQLException: java.lang.NullPointerException java.lang.NullPointerException
at org.dbunit.database.DatabaseDataSet.initialize(DatabaseDataSet.java:243)
at org.dbunit.database.DatabaseDataSet.getTableNames(DatabaseDataSet.java:272)
at org.dbunit.database.DatabaseDataSet.createIterator(DatabaseDataSet.java:258)
at org.dbunit.dataset.AbstractDataSet.iterator(AbstractDataSet.java:189)
at org.dbunit.dataset.stream.DataSetProducerAdapter.(DataSetProducerAdapter.java:63)
at org.dbunit.dataset.xml.XmlDataSetWriter.write(XmlDataSetWriter.java:128)
at org.dbunit.dataset.xml.XmlDataSet.write(XmlDataSet.java:104)
at org.dbunit.dataset.xml.XmlDataSet.write(XmlDataSet.java:91)
at pms.DatabaseExporter.exportToXML(DatabaseExporter.java:181)
at pms.DatabaseExporter.main(DatabaseExporter.java:301)
Caused by: java.sql.SQLException: java.lang.NullPointerException java.lang.NullPointerException
at org.hsqldb.jdbc.Util.sqlException(Util.java:224)
at org.hsqldb.jdbc.JDBCStatement.fetchResult(JDBCStatement.java:1830)
at org.hsqldb.jdbc.JDBCStatement.executeQuery(JDBCStatement.java:181)
at org.hsqldb.jdbc.JDBCDatabaseMetaData.execute(JDBCDatabaseMetaData.java:6150)
at org.hsqldb.jdbc.JDBCDatabaseMetaData.getTables(JDBCDatabaseMetaData.java:3170)
at org.dbunit.database.DefaultMetadataHandler.getTables(DefaultMetadataHandler.java:137)
at org.dbunit.database.DatabaseDataSet.initialize(DatabaseDataSet.java:199)
... 9 more
Caused by: org.hsqldb.HsqlException: java.lang.NullPointerException
at org.hsqldb.error.Error.error(Error.java:108)
at org.hsqldb.result.Result.newErrorResult(Result.java:1069)
at org.hsqldb.StatementDMQL.execute(StatementDMQL.java:192)
at org.hsqldb.Session.executeCompiledStatement(Session.java:1315)
at org.hsqldb.Session.executeDirectStatement(Session.java:1206)
at org.hsqldb.Session.execute(Session.java:990)
at org.hsqldb.jdbc.JDBCStatement.fetchResult(JDBCStatement.java:1822)
... 14 more
Caused by: java.lang.NullPointerException
at org.hsqldb.types.CharacterType.compare(CharacterType.java:418)
at org.hsqldb.index.IndexAVL.compareRowForInsertOrDelete(IndexAVL.java:617)
at org.hsqldb.index.IndexAVLMemory.insert(IndexAVLMemory.java:214)
at org.hsqldb.persist.RowStoreAVL.indexRow(RowStoreAVL.java:171)
at org.hsqldb.persist.RowStoreAVLHybridExtended.indexRow(RowStoreAVLHybridExtended.java:99)
at org.hsqldb.Table.insertSys(Table.java:2625)
at org.hsqldb.dbinfo.DatabaseInformationMain.SYSTEM_TABLES(DatabaseInformationMain.java:2353)
at org.hsqldb.dbinfo.DatabaseInformationMain.generateTable(DatabaseInformationMain.java:348)
at org.hsqldb.dbinfo.DatabaseInformationFull.generateTable(DatabaseInformationFull.java:379)
at org.hsqldb.dbinfo.DatabaseInformationMain.setStore(DatabaseInformationMain.java:507)
at org.hsqldb.persist.PersistentStoreCollectionSession.getStore(PersistentStoreCollectionSession.java:138)
at org.hsqldb.Table.getRowStore(Table.java:2817)
at org.hsqldb.RangeVariable$RangeIteratorMain.(RangeVariable.java:939)
at org.hsqldb.RangeVariable$RangeIteratorMain.(RangeVariable.java:917)
at org.hsqldb.RangeVariable.getIterator(RangeVariable.java:770)
at org.hsqldb.QuerySpecification.buildResult(QuerySpecification.java:1293)
at org.hsqldb.QuerySpecification.getSingleResult(QuerySpecification.java:1245)
at org.hsqldb.QuerySpecification.getResult(QuerySpecification.java:1235)
at org.hsqldb.StatementQuery.getResult(StatementQuery.java:66)
at org.hsqldb.StatementDMQL.execute(StatementDMQL.java:190)
... 18 more
I've googled and couldn't find anything relating to this kind of error during export. I'm not that experienced with SQL or JDBC so I'm hoping there's enough info in the stack trace for someone more knowledgeable to tell me what's going wrong. If there's some other library that would be better for my needs, I have no problem switching... The only thing I need is export/import with XML right now, so I'm not using DBUnit for anything else. Anyway if anybody can tell me what's going on wrong or if I ought to be using something else I'd really appreciate it.
This is an error in the particular version of HSQLDB's system table creation, which was spotted and corrected recently. You can try the updated HSQLDB jar from http://hsqldb.org/support/
I am seeing the following error when trying to search using Lucene. (version 1.4.3). Any ideas as to why I could be seeing this and how to fix it?
Caused by: java.io.IOException: read past EOF
at org.apache.lucene.store.InputStream.refill(InputStream.java:154)
at org.apache.lucene.store.InputStream.readByte(InputStream.java:43)
at org.apache.lucene.store.InputStream.readVInt(InputStream.java:83)
at org.apache.lucene.index.FieldInfos.read(FieldInfos.java:195)
at org.apache.lucene.index.FieldInfos.<init>(FieldInfos.java:55)
at org.apache.lucene.index.SegmentReader.initialize(SegmentReader.java:109)
at org.apache.lucene.index.SegmentReader.<init>(SegmentReader.java:89)
at org.apache.lucene.index.IndexReader$1.doBody(IndexReader.java:118)
at org.apache.lucene.store.Lock$With.run(Lock.java:109)
at org.apache.lucene.index.IndexReader.open(IndexReader.java:111)
at org.apache.lucene.index.IndexReader.open(IndexReader.java:106)
at org.apache.lucene.search.IndexSearcher.<init>(IndexSearcher.java:43)
In this same environment I also see the following error:
Caused by: java.io.IOException: Lock obtain timed out:
Lock#/tmp/lucene-3ec31395c8e06a56e2939f1fdda16c67-write.lock
at org.apache.lucene.store.Lock.obtain(Lock.java:58)
at org.apache.lucene.index.IndexWriter.<init>(IndexWriter.java:223)
at org.apache.lucene.index.IndexWriter.<init>(IndexWriter.java:213)
The same code works in a test environment, however not in production. Cannot identify any obvious differences between the two environments.
File permissions are wrong (it needs write permission) or your are not able to access a locked file that the current process needs.