配置好mongodb连接之后，点击预览报下面的错：
报错：
java.lang.NoClassDefFoundError: javax/crypto/spec/PBEKeySpec
at com.mongodb.DBPort$ScramSha1Authenticator$ScramSha1SaslClient.Hi(DBPort.java:822)
at com.mongodb.DBPort$ScramSha1Authenticator$ScramSha1SaslClient.computeClientFinalMessage(DBPort.java:747)
at com.mongodb.DBPort$ScramSha1Authenticator$ScramSha1SaslClient.evaluateChallenge(DBPort.java:681)
at com.mongodb.DBPort$SaslAuthenticator.authenticate(DBPort.java:904)
at com.mongodb.DBPort.authenticate(DBPort.java:432)
at com.mongodb.DBPort.checkAuth(DBPort.java:443)
at com.mongodb.DBTCPConnector.innerCall(DBTCPConnector.java:289)
at com.mongodb.DBTCPConnector.call(DBTCPConnector.java:269)
at com.mongodb.DBCollectionImpl.find(DBCollectionImpl.java:84)
at com.mongodb.DBCollectionImpl.find(DBCollectionImpl.java:66)
at com.mongodb.DBCursor._check(DBCursor.java:498)
at com.mongodb.DBCursor._hasNext(DBCursor.java:621)
at com.mongodb.DBCursor.hasNext(DBCursor.java:657)
at org.pentaho.mongo.wrapper.cursor.DefaultCursorWrapper.hasNext(DefaultCursorWrapper.java:34)
at org.pentaho.di.trans.steps.mongodbinput.MongoDbInput.processRow(MongoDbInput.java:89)
at org.pentaho.di.trans.step.RunThread.run(RunThread.java:62)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.ClassNotFoundException: javax.crypto.spec.PBEKeySpec not found by org.mongodb.mongo-java-driver [59]
at org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDelegation(BundleWiringImpl.java:1532)
at org.apache.felix.framework.BundleWiringImpl.access$400(BundleWiringImpl.java:75)
at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.loadClass(BundleWiringImpl.java:1955)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
... 17 more
解决办法：
目录：data-integration\system\karaf\etc\config.properties
文件中下部有一行 org.osgi.framework.bootdelegation=参数：
在末尾处加上 ,javax.crypto,javax.crypto.*
Mongo就可以正常连接读取数据了。