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：

kettle安装文件目录：data-integration\system\karaf\etc\config.properties

文件中下部有一行 org.osgi.framework.bootdelegation=（一堆参数）

在末尾处加上  ,javax.crypto,javax.crypto.*

Mongo就可以正常连接读取数据了。

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