Write a file on hdfs with permissions enabled - java

I try to write a file on hdfs using Java (v 1.8) with permissions enabled.
As hadoop instance I have used ready docker image : https://hub.docker.com/r/sequenceiq/hadoop-docker/
I have followed Write a file in hdfs with Java to do something like the following:
Configuration configuration = new Configuration();
configuration.set("fs.defaultFS", "hdfs://127.0.0.1:9000/user/root");
configuration.set("hadoop.job.ugi", "root");
FileSystem hdfs = FileSystem.get(configuration );
Path file = new Path("hdfs://127.0.0.1:9000//user/root/test.txt");
if ( hdfs.exists( file )) { //hdfs.delete( file, true );
System.out.println("File exist");
}
OutputStream os = hdfs.create( file,
new Progressable() {
public void progress() {
System.out.println("");
} });
BufferedWriter br = new BufferedWriter( new OutputStreamWriter( os, "UTF-8" ) );
br.write("Hello World");
br.close();
hdfs.close();
I get the following exceptions:
org.apache.hadoop.security.AccessControlException: Permission denied: user=xxx, access=WRITE, inode="/user/root/text.txt":root:supergroup:drwxr-xr-x
at org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.check(FSPermissionChecker.java:319)
at org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.check(FSPermissionChecker.java:292)
at org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.checkPermission(FSPermissionChecker.java:213)
at org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.checkPermission(FSPermissionChecker.java:190)
at org.apache.hadoop.hdfs.server.namenode.FSDirectory.checkPermission(FSDirectory.java:1698)
at org.apache.hadoop.hdfs.server.namenode.FSDirectory.checkPermission(FSDirectory.java:1682)
at org.apache.hadoop.hdfs.server.namenode.FSDirectory.checkAncestorAccess(FSDirectory.java:1665)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFileInternal(FSNamesystem.java:2494)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFileInt(FSNamesystem.java:2429)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFile(FSNamesystem.java:2312)
at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.create(NameNodeRpcServer.java:622)
at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.create(ClientNamenodeProtocolServerSideTranslatorPB.java:397)
at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:616)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:969)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2049)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2045)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2043)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
at org.apache.hadoop.ipc.RemoteException.instantiateException(RemoteException.java:106)
at org.apache.hadoop.ipc.RemoteException.unwrapRemoteException(RemoteException.java:73)
at org.apache.hadoop.hdfs.DFSOutputStream.newStreamForCreate(DFSOutputStream.java:1628)
at org.apache.hadoop.hdfs.DFSClient.create(DFSClient.java:1703)
at org.apache.hadoop.hdfs.DFSClient.create(DFSClient.java:1638)
at org.apache.hadoop.hdfs.DistributedFileSystem$7.doCall(DistributedFileSystem.java:448)
at org.apache.hadoop.hdfs.DistributedFileSystem$7.doCall(DistributedFileSystem.java:444)
at org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
at org.apache.hadoop.hdfs.DistributedFileSystem.create(DistributedFileSystem.java:459)
at org.apache.hadoop.hdfs.DistributedFileSystem.create(DistributedFileSystem.java:387)
at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:909)
at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:802)
at com.finscience.Main.main(Main.java:28)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)
Caused by: org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.security.AccessControlException): Permission denied: user=stefano, access=WRITE, inode="/user/root/capacity-scheduler.xml":root:supergroup:drwxr-xr-x
at org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.check(FSPermissionChecker.java:319)
at org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.check(FSPermissionChecker.java:292)
at org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.checkPermission(FSPermissionChecker.java:213)
at org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.checkPermission(FSPermissionChecker.java:190)
at org.apache.hadoop.hdfs.server.namenode.FSDirectory.checkPermission(FSDirectory.java:1698)
at org.apache.hadoop.hdfs.server.namenode.FSDirectory.checkPermission(FSDirectory.java:1682)
at org.apache.hadoop.hdfs.server.namenode.FSDirectory.checkAncestorAccess(FSDirectory.java:1665)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFileInternal(FSNamesystem.java:2494)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFileInt(FSNamesystem.java:2429)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFile(FSNamesystem.java:2312)
at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.create(NameNodeRpcServer.java:622)
at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.create(ClientNamenodeProtocolServerSideTranslatorPB.java:397)
at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:616)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:969)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2049)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2045)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2043)
at org.apache.hadoop.ipc.Client.call(Client.java:1476)
at org.apache.hadoop.ipc.Client.call(Client.java:1407)
at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:229)
at com.sun.proxy.$Proxy9.create(Unknown Source)
at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.create(ClientNamenodeProtocolTranslatorPB.java:296)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:187)
at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:102)
at com.sun.proxy.$Proxy10.create(Unknown Source)
at org.apache.hadoop.hdfs.DFSOutputStream.newStreamForCreate(DFSOutputStream.java:1623)
... 15 more
how can I write a file on hdfs without disable permissions?

HDFS is a POSIX-like file-system. Access to the directories and files are restricted by ACLs. To be able to write files, you have to deal with the ACLs.
If you are not familiar with the concept, just check out the following link https://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-hdfs/HdfsPermissionsGuide.html
In your specific case, it seems that you want to write into the home directory of the root.
You have three options:
* Execute the application as root user
* Add the service user under which the Java Application is run to the root users group
* change the owner of that directory(chown) or the rights(chmod)

Related

Unable to find LoginModule class: com.sun.security.auth.module.UnixLoginModule

Trying to access HDFS location using Kerberose authentication, but getting below error message:
java.io.IOException: failure to login
at org.apache.hadoop.security.UserGroupInformation.loginUserFromSubject(UserGroupInformation.java:839)
at org.apache.hadoop.security.UserGroupInformation.getLoginUser(UserGroupInformation.java:775)
at org.apache.hadoop.security.UserGroupInformation.getCurrentUser(UserGroupInformation.java:648)
at org.apache.hadoop.fs.FileSystem$Cache$Key.<init>(FileSystem.java:2859)
at org.apache.hadoop.fs.FileSystem$Cache$Key.<init>(FileSystem.java:2851)
at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2714)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:382)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:181)
at com.xyz.module.submodule.common.utils.HDFSPropertyLookup.loadProperties(HDFSPropertyLookup.java:75)
at com.xyz.module.submodule.common.utils.HDFSPropertyLookup.initialize(HDFSPropertyLookup.java:37)
at com.xyz.module.submodule.common.utils.HDFSPropertyLookupTest.initializePropertiesFile(HDFSPropertyLookupTest.java:16)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:24)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:252)
at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:141)
at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:112)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:189)
at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:165)
at org.apache.maven.surefire.booter.ProviderFactory.invokeProvider(ProviderFactory.java:85)
at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:115)
at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:75)
Caused by: javax.security.auth.login.LoginException: unable to find LoginModule class: com.sun.security.auth.module.UnixLoginModule
at javax.security.auth.login.LoginContext.invoke(LoginContext.java:794)
at javax.security.auth.login.LoginContext.access$000(LoginContext.java:195)
at javax.security.auth.login.LoginContext$4.run(LoginContext.java:682)
at javax.security.auth.login.LoginContext$4.run(LoginContext.java:680)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.login.LoginContext.invokePriv(LoginContext.java:680)
at javax.security.auth.login.LoginContext.login(LoginContext.java:587)
at org.apache.hadoop.security.UserGroupInformation.loginUserFromSubject(UserGroupInformation.java:813)
... 31 more
Cause: LoginModule class: com.sun.security.auth.module.UnixLoginModule not found.
Want to know in which .jar file com.sun.security.auth.module.UnixLoginModule is present?
If someone might have faced this issue before, then please let help!
This issue got resolved!
Let me share the real cause and how it got resolved?
In unit test code, I was setting the os.name system property value to different operating system for my test case scenario as below:
System.setProperty("os.name", "Windows");
I was setting above properties value with Windows/Unix/MAC etc, but I missed to reset to its original value.
In same project there I was executing FileSystem.get(new Configuration()); from Hadoop API, in which Kerberose authentication was set.
So while execution operating system name was getting changed to some other name and it was not reset to original name.
Solution:
So in setup method I collected the original OS name to some other variable and after all test case completion reset to original name as below:
#BeforeClass
public static void setup() throws IOException {
System.setProperty("os.name.orig", System.getProperty("os.name"));
}
// other test case methods continue...
#AfterClass
public static void clearProperties() throws IOException {
System.setProperty("os.name", System.getProperty("os.name.orig"));
System.clearProperty("os.name.orig");
}
After above setting OS was reverted back to its original name and everything started working properly.
Hope this will help others in future!!!

How to open xls file with macros inside using apache poi?

The problem is that I can't open workbook from inputstream with xls file.
When I trying open it by WorkbookFactory.create(inputStream) I get:
Exception in thread "main" org.apache.poi.hssf.record.RecordFormatException: Not enough data (0) to read requested (1) bytes
at org.apache.poi.hssf.record.RecordInputStream.checkRecordPosition(RecordInputStream.java:216)
at org.apache.poi.hssf.record.RecordInputStream.readByte(RecordInputStream.java:224)
at org.apache.poi.hssf.record.RecordInputStream.readUByte(RecordInputStream.java:260)
at org.apache.poi.hssf.record.DConRefRecord.<init>(DConRefRecord.java:174)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
at org.apache.poi.hssf.record.RecordFactory$ReflectionConstructorRecordCreator.create(RecordFactory.java:87)
at org.apache.poi.hssf.record.RecordFactory.createSingleRecord(RecordFactory.java:338)
at org.apache.poi.hssf.record.RecordFactoryInputStream.readNextRecord(RecordFactoryInputStream.java:310)
at org.apache.poi.hssf.record.RecordFactoryInputStream.nextRecord(RecordFactoryInputStream.java:276)
at org.apache.poi.hssf.record.RecordFactory.createRecords(RecordFactory.java:480)
at org.apache.poi.hssf.usermodel.HSSFWorkbook.<init>(HSSFWorkbook.java:326)
at org.apache.poi.ss.usermodel.WorkbookFactory.create(WorkbookFactory.java:115)
at org.apache.poi.ss.usermodel.WorkbookFactory.create(WorkbookFactory.java:172)
at org.apache.poi.ss.usermodel.WorkbookFactory.create(WorkbookFactory.java:143)
at ru.efo.search.support.excel.WorkBookReader.init(WorkBookReader.java:67)
at ru.efo.search.support.excel.WorkBookReader.<init>(WorkBookReader.java:42)
at ru.efo.search.support.excel.WorkBookReader.main(WorkBookReader.java:126)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)
But if the same file is .xlsm format it works ok, because WorkbookFactory uses XSSFWorkbook instead of HSSFWorkbook. Unfortunately, I have only InputStream in my application and I can't change file format. Please, help!

How can i read extended file attribute in Java?

I have file with extended attribute user.MYATTR
when I run command: getfattr fileName -d, I get this:
user.MYATTR="attribute_value"
My OS is Red Hat Enterprise Linux Server release 6.4 (Santiago)
but when I am running my Java code
LOG.debug("readExtentedAttribute(path={},name={}", path, name);
UserDefinedFileAttributeView view = Files.getFileAttributeView(path, UserDefinedFileAttributeView.class);
ByteBuffer buffer = ByteBuffer.allocate(view.size(name));
view.read(name, buffer);
buffer.flip();
String value = Charset.defaultCharset().decode(buffer).toString();
LOG.trace("extended attribute value = {}", value);
I am getting exception
java.nio.file.FileSystemException: /opt/myfolder/myfile: Unable to get size of extended attribute 'user.MYATTR': No data available
at sun.nio.fs.LinuxUserDefinedFileAttributeView.size(LinuxUserDefinedFileAttributeView.java:141) ~[na:1.7.0_25]
at sk.tempest.cda.impex.service.FileServiceImpl.readExtentedAttribute(FileServiceImpl.java:39) ~[impex-impl-0.0.1-SNAPSHOT.jar!/:na]
at sk.tempest.cda.impex.service.TapeMediumServiceImpl.hasDissemFlag(TapeMediumServiceImpl.java:189) ~[impex-impl-0.0.1-SNAPSHOT.jar!/:na]
at sun.reflect.GeneratedMethodAccessor35.invoke(Unknown Source) ~[na:na]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.7.0_25]
at java.lang.reflect.Method.invoke(Method.java:606) ~[na:1.7.0_25]
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317) ~[spring-aop-4.0.3.RELEASE.jar!/:4.0.3.RELEASE]
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:201) ~[spring-aop-4.0.3.RELEASE.jar!/:4.0.3.RELEASE]
at com.sun.proxy.$Proxy85.hasDissemFlag(Unknown Source) ~[na:na]
at sk.tempest.cda.impex.service.TapeStorageServiceImpl.registerNewMedia(TapeStorageServiceImpl.java:158) ~[impex-impl-0.0.1-SNAPSHOT.jar!/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.7.0_25]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[na:1.7.0_25]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.7.0_25]
at java.lang.reflect.Method.invoke(Method.java:606) ~[na:1.7.0_25]
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317) ~[spring-aop-4.0.3.RELEASE.jar!/:4.0.3.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190) ~[spring-aop-4.0.3.RELEASE.jar!/:4.0.3.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) ~[spring-aop-4.0.3.RELEASE.jar!/:4.0.3.RELEASE]
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:98) ~[spring-tx-4.0.3.RELEASE.jar!/:4.0.3.RELEASE]
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:262) ~[spring-tx-4.0.3.RELEASE.jar!/:4.0.3.RELEASE]
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:95) ~[spring-tx-4.0.3.RELEASE.jar!/:4.0.3.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.0.3.RELEASE.jar!/:4.0.3.RELEASE]
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207) ~[spring-aop-4.0.3.RELEASE.jar!/:4.0.3.RELEASE]
at com.sun.proxy.$Proxy87.registerNewMedia(Unknown Source) ~[na:na]
at sk.tempest.cda.impex.service.WorkerServiceImpl.checkNewMedia(WorkerServiceImpl.java:46) ~[impex-impl-0.0.1-SNAPSHOT.jar!/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.7.0_25]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[na:1.7.0_25]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.7.0_25]
at java.lang.reflect.Method.invoke(Method.java:606) ~[na:1.7.0_25]
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317) ~[spring-aop-4.0.3.RELEASE.jar!/:4.0.3.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190) ~[spring-aop-4.0.3.RELEASE.jar!/:4.0.3.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) ~[spring-aop-4.0.3.RELEASE.jar!/:4.0.3.RELEASE]
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:98) ~[spring-tx-4.0.3.RELEASE.jar!/:4.0.3.RELEASE]
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:262) ~[spring-tx-4.0.3.RELEASE.jar!/:4.0.3.RELEASE]
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:95) ~[spring-tx-4.0.3.RELEASE.jar!/:4.0.3.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.0.3.RELEASE.jar!/:4.0.3.RELEASE]
at org.springframework.aop.interceptor.AsyncExecutionInterceptor$1.call(AsyncExecutionInterceptor.java:97) ~[spring-aop-4.0.3.RELEASE.jar!/:4.0.3.RELEASE]
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) ~[na:1.7.0_25]
at java.util.concurrent.FutureTask.run(FutureTask.java:166) ~[na:1.7.0_25]
at java.lang.Thread.run(Thread.java:724) ~[na:1.7.0_25]
Finally I found that when I want to read attribute user.MYATTR, i have to use name MYATTR.
I just wanna mention what interesting behaviour I found, that may lead to mystakes and i wanna warn you :)
My file has these two attributes:
user.MYATTR1
user.somethingElse.MYATTR2
When I was listing attributes using view.list() method I saw only this one (without user.):
MYATTR1
when i wanna read attribute value, i have to use name of attribute without 'user.', so for mentioned attributes it is:
MYATTR1
or
somethingElse.MYATTR2
Did you read the docs to the class UserDefinedFileAttributeView?
Reading carefully gives a few hints, why your code doesn't work properly.
For example you can check that:
... This FileAttributeView is not intended for use where the size of an
attribute value is larger than Integer.MAX_VALUE ...
or check, if you have a security manager installed:
... in the case of the default provider at least, all methods that
access user-defined attributes require the
RuntimePermission("accessUserDefinedAttributes") permission when a
security manager is installed. ...
Or try out another method to get an attribute:
... Where dynamic access to file attributes is required, the
getAttribute method may be used to read the attribute value. The attribute value is returned as a byte array (byte[]). ...
Maybe any of the hints helps you, good luck! :-)
EDIT
Here's an example code, which checks, if your file system provides user defined file attributes and prints them (on succes):
Path file = Paths.get("filename.ext");
// check that user defined attributes are supported by the file system
FileStore store = file.getFileStore();
if (!store.supportsFileAttributeView("xattr")) {
System.err.format("UserDefinedFileAttributeView not supported on %s\n", store);
System.exit(-1);
}
UserDefinedFileAttributeView view = file.getFileAttributeView(UserDefinedFileAttributeView.class);
// list user defined attributes
if (args.length == 1) {
System.out.println(" Size Name");
System.out.println("-------- --------------------------------------");
for (String name: view.list()) {
System.out.format("%8d %s\n", view.size(name), name);
}
}
Full source code here linked from this page your question code is from ;-)

Eclipse IDE doesn't recognize mysql driver

This has been extremely frustrating, especially since I've been all over the forums and have followed all the directions, as far as I can tell.
I am trying to create a connection to a local mysql database. First I downloaded the mysql driver from http://dev.mysql.com/downloads/connector/j using the platform independent TAR (I'm on ubuntu). Then I placed the resultant JAR into a new folder I created for my project call /lib, and then right-clicked and selected "Add to Build Path". It now shows up as a Referenced Library.
For the code, I am doing the typical things you would do:
try {
Class.forName("com.mysql.jdbc.Driver");
String db_url = "jdbc:mysql://localhost/project";
connect = DriverManager.getConnection(db_url, "user", "password");
statement = connect.createStatement();
resultSet = statement.executeQuery("select * from database.table");
while (resultSet.next()) {
int id = resultSet.getInt("ID");
String name = resultSet.getString("Name");
System.out.println("(ID: " + id + ") (Name: " + name + ")");
}
} catch (ClassNotFoundException | SQLException e) {
e.printStackTrace();
}
But for whatever reason, I still get "java.lang.ClassNotFoundException: com.mysql.jdbc.Driver cannot be found"
I'm sure it's something completely idiotic on my part, but any pointers as to what I'm missing?
Here is the stack trace:
java.lang.ClassNotFoundException: com.mysql.jdbc.Driver cannot be found by com.personal.recipes_1.0.0.qualifier
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:501)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:421)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:412)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:190)
at com.personal.recipes.test.TestUtils.execute(TestUtils.java:22)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:56)
at org.eclipse.e4.core.internal.di.InjectorImpl.invokeUsingClass(InjectorImpl.java:243)
at org.eclipse.e4.core.internal.di.InjectorImpl.invoke(InjectorImpl.java:224)
at org.eclipse.e4.core.contexts.ContextInjectionFactory.invoke(ContextInjectionFactory.java:132)
at org.eclipse.e4.core.commands.internal.HandlerServiceHandler.execute(HandlerServiceHandler.java:167)
at org.eclipse.core.commands.Command.executeWithChecks(Command.java:499)
at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:508)
at org.eclipse.e4.core.commands.internal.HandlerServiceImpl.executeHandler(HandlerServiceImpl.java:213)
at org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem.executeItem(HandledContributionItem.java:850)
at org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem.handleWidgetSelection(HandledContributionItem.java:743)
at org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem.access$7(HandledContributionItem.java:727)
at org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem$4.handleEvent(HandledContributionItem.java:662)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1392)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3742)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3363)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1113)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:997)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:138)
at org.eclipse.e4.ui.internal.workbench.swt.E4Application.start(E4Application.java:162)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:354)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:181)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:636)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:591)
at org.eclipse.equinox.launcher.Main.run(Main.java:1450)
at org.eclipse.equinox.launcher.Main.main(Main.java:1426)
So I probably didn't explain my problem well enough before. The question specifically related to getting my Eclipse RCP application to see the driver. After talking to a friend he reminded me that I needed to add the mysql jar to the .MF file directly. Once I knew that I found a ton of posts on various forums answering my question.
I added the following line and I'm able to make the connection to the database without issue:
"Bundle-ClassPath: lib/mysql-connector-java-5.1.30-bin.jar, ."
The (.) at the end also was very important and stymied me for a few minutes.
I just made a quick copy / paste of your code into a fresh project, installed the driver in lib... works like a charm. So did you do something before the code snippet?

javax.xml.transform.TransformerException: java.io.FileNotFoundException: <file_name>(Access is denied)

I am getting exception at last line of code -
Transformer transformer = TransformerFactory.newInstance().newTransformer();
DOMSource xmlSource = new DOMSource(document);
StreamResult result;
File f = new File(sFilePath);
if (f.exists() == false) {
result = new StreamResult(f);
} else {
result = new StreamResult(sFilePath);
}
transformer.transform(xmlSource, result);
The exception stacktrace is -
java.io.FileNotFoundException:
C:\ProgramData.\config\.xml (Access is
denied) stacktrace javax.xml.transform.TransformerException:
java.io.FileNotFoundException:
C:\ProgramData.\config\.xml (Access is
denied) at
com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.getOutputHandler(Unknown
Source) at
com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(Unknown
Source) at com..main.dr.a(Unknown Source) at
com..main.dr.a(Unknown Source) at
com..main.dr.a(Unknown Source) at
com..main.h.k(Unknown Source) at
com..main.ay.run(Unknown Source) Caused by:
java.io.FileNotFoundException:
C:\ProgramData.\config\.xml (Access is
denied) at java.io.FileOutputStream.open(Native Method) at
java.io.FileOutputStream. (Unknown Source) at
java.io.FileOutputStream. (Unknown Source) ... 7 more ---------
java.io.FileNotFoundException:
C:\ProgramData.\config\.xml (Access is
denied) at java.io.FileOutputStream.open(Native Method) at
java.io.FileOutputStream. (Unknown Source) at
java.io.FileOutputStream. (Unknown Source) at
com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.getOutputHandler(Unknown
Source) at
com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(Unknown
Source) at com..main.dr.a(Unknown Source) at
com..main.dr.a(Unknown Source) at
com..main.dr.a(Unknown Source) at
com..main.h.k(Unknown Source) at
com..main.ay.run(Unknown Source) and the cause
isjava.io.FileNotFoundException:
C:\ProgramData.\config\.xml (Access is
denied)
Try changing it to use the file's URI.getPath() instead of just passing File object into StreamResult.
eg. StreamResult result = new StreamResult(anOutputFile.toURI().getPath());
Sounds like file permissions on your XML files, doesn't it?
If you're executing from a web context, please bear in mind that the web user (for example, "nobody" under Linux/Apache, or "IUSR_MACHINE" under Windows/IIS) has MINIMAL privileges to access your filesystem.
And this is a Good Thing: especially if your application is exposed to the Internet :)
PS:
Also, the directory path you cited doesn't look right:
C:\ProgramData.\config.xml
Are you sure it's not supposed to be "C:\Program Data\config.xml"????
PPS:
While we're talking about "file permissions"; Windows Vista, Windows 7 and Server 2008 all have stricter rules against accessing anything in a drive's root (EX: "c:\") or system directories (EX: "c:\windows" or "c:\Program files").
Try checking whether the file you try to transform does have the values and that they are valid.
May be you are iterating over a set of files using a loop and some times you end up trying to transform files which do not have any value like null or "".
try This
file = new File(System.getProperty("user.dir") + "/YOURFILEADDRESS.xml");

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