Algorithm HmacSHA256 not available

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场景：

有一段代码需要访问Amazon，直接执行main方法是没问题的。可是把代码打成jar包，用ProcessBuilder执行java -jar的方式来run的时候，抛出了Exception。

Algorithm HmacSHA256 not available 异常信息

Exception in thread "pool-1-thread-1" com.amazonaws.AmazonClientException: Unable to calculate a 
request signature: Unable to calculate a request signature: Algorithm HmacSHA256 not available
at com.amazonaws.auth.AbstractAWSSigner.sign(AbstractAWSSigner.java:81)
at com.amazonaws.auth.AWS4Signer.computeSignature(AWS4Signer.java:289)
at com.amazonaws.auth.AWS4Signer.sign(AWS4Signer.java:127)
at com.amazonaws.http.AmazonHttpClient.executeOneRequest(AmazonHttpClient.java:646)
at com.amazonaws.http.AmazonHttpClient.executeHelper(AmazonHttpClient.java:454)
at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:294)
at com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient.invoke(AmazonDynamoDBClient.java:3106)
at com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient.batchWriteItem(AmazonDynamoDBClient.java:771)
at com.amazonaws.services.dynamodbv2.document.internal.BatchWriteItemImpl.doBatchWriteItem(BatchWriteItemImpl.java:111)
at com.amazonaws.services.dynamodbv2.document.internal.BatchWriteItemImpl.batchWriteItem(BatchWriteItemImpl.java:52)
at com.amazonaws.services.dynamodbv2.document.DynamoDB.batchWriteItem(DynamoDB.java:159)
at com.saasbee.webapp.service.search.DocumentService.store(DocumentService.java:79)
at com.saasbee.webapp.service.search.thread.ParseTaskThread.run(ParseTaskThread.java:97)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: com.amazonaws.AmazonClientException: Unable to calculate a request signature: Algorithm HmacSHA256 not available
at com.amazonaws.auth.AbstractAWSSigner.sign(AbstractAWSSigner.java:91)
at com.amazonaws.auth.AbstractAWSSigner.sign(AbstractAWSSigner.java:79)
... 15 more
Caused by: java.security.NoSuchAlgorithmException: Algorithm HmacSHA256 not available
at javax.crypto.Mac.getInstance(Mac.java:181)
at com.amazonaws.auth.AbstractAWSSigner.sign(AbstractAWSSigner.java:87)
... 16 more

Algorithm HmacSHA256 not available 解决办法

猜测应该是Amazon的security有关方面的问题。最终我的解决方法如下：
在pom.xml里面加入${JAVA_HOME}/jre/lib/sunjce_provider.jar的依赖，然后重新package，异常消失。

<dependency>
    <groupId>org.sun</groupId>
    <artifactId>sunjce_provider</artifactId>
    <scope>system</scope>
    <version>1.0</version>
    <systemPath>${JAVA_HOME}/jre/lib/sunjce_provider.jar</systemPath>
</dependency>

缺点：要求调用这个jar的程序的jre版本与生成这个jar的jre版本一致。

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