IllegalStateException in Amazon SDK for Java

In one of our projects we need to communicate with Amazon S3. We use the SDK for Java provided by Amazon itself. The library incorporates Apache HttpComponents for managing HTTP and associated protocols. We noticed there was an issue with the way how Amazon SDK uses the Apache library.

Race condition in Amazon SDK

Here’s what we found in the project’s logs.

<br /> java.lang.IllegalStateException: Content has been consumed<br /> at org.apache.http.entity.BasicHttpEntity.getContent(BasicHttpEntity.java:84)<br /> at com.amazonaws.http.AmazonHttpClient.executeHelper(AmazonHttpClient.java:254)<br /> at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:168)<br /> at com.amazonaws.services.s3.AmazonS3Client.invoke(AmazonS3Client.java:2555)<br /> at com.amazonaws.services.s3.AmazonS3Client.putObject(AmazonS3Client.java:1044)<br /> at com.amazonaws.services.s3.AmazonS3Client.putObject(AmazonS3Client.java:928)<br /> at com.amazonaws.services.s3.AmazonS3$putObject.call(Unknown Source)<br /> ...<br /> 

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The stacktrace led us to AmazonS3Client class from Amazon SDK for Java. We were using version 1.2.15 of this library, so we took a look into its code and saw the following in com.amazonaws.http.AmazonHttpClient.executeHelper(AmazonHttpClient.java:254):

<br <a style="text-decoration: none; color: inherit; cursor: default; outline: none;" href="http://essaybuyersclub.com/">pay someone to do my accounting homework</a> /> if (entity != null && entity.getContent().markSupported()) {<br /> entity.getContent().reset();<br /> }<br /> 

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Let’s take spy on cell phone a look at documentation of method public InputStream getContent() from the entity, object of org.apache.http.entity.BasicHttpEntity:

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It looks like getContent should only be called spy a phone free once and the result should be kept locally if we want to reuse it. So, that’s our culprit.

Fix in the newest version

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of Amazon library

The first step for us was to find out if the issue lexapro with vyvanse interactions was fixed in the most recent version of the library. And, actually, it was!

In version 1.3.22 of Amazon SDK, in class AmazonHttpClient around line 262 we can see:

<br /> InputStream content = entity.getContent();<br /> if ( retryCount > 0 ) {<br /> if ( content.markSupported() ) {<br /> content.reset();<br /> content.mark(-1);<br /> }<br /> }<br /> 

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That’s exactly canada pharmacy what we were looking for! entity.getContent() is called once, and the input stream is reused later.

Analyze the source code, read the documentation

And now, since version 1.3.22, we can use the library like:

<br <a style="text-decoration: none; color: inherit; cursor: default; outline: none;" href="http://spyappforcellphone.com/">spy cell phone by number</a> /> AWSCredentials awsCreds = ...</p> <p>AmazonS3Client client = new AmazonS3Client(awsCreds)</p> <p>client.putObject(bucket, key, inputStream,<br /> getObjectMetadata(contentType, contentLength))</p> <p>client.setObjectAcl(bucket, key, CannedAccessControlList.PublicRead)<br /> 

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The lesson to remember is that analyzing the source code and e-stealth ultimate mobile phone spy documentation together helps hunting down even hard to reproduce bugs.

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