[Which datasource is recommended to use for better performance]

This is a tricky question to answer here the way the question is posted, all will depend on the type and amount of data you have and the complexity of the reports you are doing.
If you can explain a bit more the use case I'm pretty sure more people will be able to help.

My quick answer here will be, use the one where is your data resides today. 

[Why is necessary Elastic IP in jaspersoft aws marketplace]

Can you show how are you connecting to RDS? And how the infrastructure looks like on AWS, did you use the provided Cloud Formation Templates?
An elastic IP is not required to connect to RDS, I think that the issue you are running into has to do with the network infrastructure you have setup.

Are you using VPC? Are you using the internal IPs in your security group?

[What is the difference between JRPdfExporter in jasper report v.3.5.3 and v6.3.1 library]

Check which report virtualizer is being used in each library that may have changed over releases. A jump from 3.5 to 6.3 a lot of years have gone by :)

http://community.jaspersoft.com/wiki/virtualizers-jasperreports

[Does CE support Kerberos?]

You should not have problems with that the Kerberos implementation should be done by the driver you are using. What are you using to connect to Hadoop? Hive, Impala, Hbase, Spark? Check the documentation of the driver you are using, 

For example for Impala check page 11 of the Driver Guide https://www.cloudera.com/documentation/other/connectors/impala-jdbc/latest/Cloudera-JDBC-Driver-for-Impala-Install-Guide.pdf

[Error installing jasper reports server 6.3 on AWS with ubuntu 14.04]

What Repo DB are you using? IS the default_master.properties file setting the right DB, driver and connection information?

[Jaspersoft Server | encrypted data in database, how to get decrypted data in jasper reports]

Hi, to decrypt the data coming from the DB you will need to do that at the Java Layer in the JRXML by using my custom class to process it.

You can achieve that using scriptlets or custom functions in Jaspersoft Studio check this link http://community.jaspersoft.com/wiki/jaspersoft-studio-expression-editor-how-extend-it-and-contribute-your-own-functions-part-2-0 

[How to setting ADFS connection on Jaspersoft on AWS]

For connecting with AD Jaspersoft uses LDAP. In the documentation, check the Jaspersoft Authentication Cookbook the section regarding LDAP and Active directory integration.

 

 

[Connect to Redshift data source on AWS Mumbai Region]

You will have to connect it manually via JDBC, since the autodiscovery feature does not support Mumbai yet.

 Check the Jaspersoft for AWS getting started guide in "Connecting to Your Data with JRS"  scroll down to the "JDBC / JNDI Connections" section

[Sizing guidelines for AWS EC2 instance types]

Wow, lots of questions :)

#1) For performance related questions this wiki page is always a good start http://community.jaspersoft.com/wiki/jasperreports-server-performance-reference

That will give you an overview on where the bottlenecks will be for a specific use case. Since there are so many moving parts (query time, fetch time, report execution, fill and export, etc) is not easy as you need to use instance X for X amount of users.

Note that in AWS new generation instance types (like m4) have more processing power per vCPU than older generations (m2) for me the bible is this site http://www.ec2instances.info/ note the difference in ECU.  One EC2 Compute Unit (ECU) provides the equivalent CPU capacity of a 1.0-1.2 GHz 2007 Opteron or 2007 Xeon processor.

The server is loaded by concurrent report executions. i.e. a user looking at an already executed report will have minimal impact, while a user generating a dashboard with 4 dashlets will be executing 4 reports simultaneously.

As a basic rule of the thumb, you can use the 100:10:1 rule; for each 100 named users you can expect 10 concurrent users from wich you can expect 1 concurrent report execution at any given time. Of course, this is also broad, you should tailor that to your use case.
Based on the little info I have I think an m3.large will become memory bound in your case since you only have 7.5GB available and I'm assuming you are running the regular AMI where JRS and the repo DB are in the same box. 
Look into the Cloud Formation Templates for clustering here http://community.jaspersoft.com/jaspersoft-aws/launch that show Launching Jaspersoft with the repository DB on RDS. Since this will offload some resources from the AMI. I do recommend for convenience using the cluster deployment even if you use only one machine :)

Regarding Dev & Tes, you are correct you should create CF templates for your environments and spin those off and on when needed. Use the ones in the link above as a reference. Is much better to automate those things, AWS have really good API's for managing this automation https://aws.amazon.com/cloudformation/

Hope this helps :)

[Audit capability not working in Jaspersoft 6.2 Professional]

The Auditing Capabilities are not available in JasperReports Server Professional (in AWS listed as reporting and Analytics) are only available in JasperReports Server Enterprise (in AWS is listed as with Multi-Tenancy) 

See https://www.jaspersoft.com/editions

[Diffrence between jaspersoft enterprise and community edition]

Note that JasperReports Server Community edition license is AGPL so that will have some implications if you are planning to integrate it with your application and your application does not have a compatible license.

[Jaspersoft server excel export cell height increases]

Since the report is exporting properly in JSS, make sure your jasperreports.properties match between Jaspersoft Studio (Properties -> Jaspersoft Studio -> Properies ) and Jasper Reports Server (/webapps/jasperserver-pro/WEB-INF/classes/jasperreports.properties)

Watch specially the net.sf.jasperreports.export.xls.* ones.

[Want to append a new PDF file in Jasper]

You can use the iText PdfReader API to append the existing PDF to the Jasper Output look into this question: http://community.jaspersoft.com/questions/844705/how-attach-pdf-file-generated-jasper-report

[how to install jasper soft on pivotal cloud foundry]

PCF as in ???
Point coordination function?
Portable Compiled Format?

https://en.wikipedia.org/wiki/PCF

[Creating a Ad Hoc report]

The " An error has occurred. Please contact your system administrator. (5321)" is a very generic erros that is normally shown where there are security issues.

Check the jasperserver.log, there you should find more meaningful explanation on what is going on. The default log file is WEB-INFlogsjasperserver.log.

[Superuser doesn't have proper permissions]

Re: #4 and the problems you caused, that is bacause your JasperServer can no longer access the repository, go to /webapps/jasperserver-pro/META-INF/context.xml and change the password for the jdbc/jasperserver JNDI connection properies in that XML file and restart the server :)

 

[Password Hash - JDBC]

Is never a good idea to tinker around the Repo DB tables a lot of bad things will happen :)

You should change the password form the UI. 

[review Jasper report]

Hi Rohit, "suggest the improvements" is a tall order, not sure you are going to get any help unless you are more specific about the improvents you need.

Also I suggest you add the report to dropbox or something and link to it for download, makes the question more readable.

[Changed db password for user "postgres" - What configs need to be updated to get JasperReports to work again?]

You need to change the JNDI connection to the repo, that is defined in <TOMCAT>/webapps/jasperserver-pro/META-INF/context.xml

There look for the JNDI connection called jdbc/jasperserver and change the password to the new one

    <Resource name="jdbc/jasperserver" auth="Container" type="javax.sql.DataSource"

        maxActive="100" maxIdle="30" maxWait="10000"

        username="postgres" password="postgres"

        driverClassName="org.postgresql.Driver"

        accessToUnderlyingConnectionAllowed = "true"

        validationQuery="SELECT 1"

        testOnBorrow="true"

        url="jdbc:postgresql://localhost:5432/jasperserver"

        factory="com.jaspersoft.jasperserver.tomcat.jndi.JSBasicDataSourceFactory"

         />

[Future date from current date]

I think that the problem you are reaching is related to daylight savings time, unfortunately in the real world not all days have 24 hours :)

Look at this post for solutions using Calendar which is the way to go in these cases http://stackoverflow.com/questions/1005523/how-to-add-one-day-to-a-date

As well as this article http://community.jaspersoft.com/wiki/dynamic-dates-reports

[Jasper Studio + Cassandra]

Can you add some info, like Cassandra version and JSS version you are using? I'm thinking with the little information given that it may be an incompatibility issue on the cassandra driver.

[I am trying to use Jaspersoft Studio 6.2.0 to modify an existing report in Fishbowl Inventory 16.1 to add one additional field and change the sort order. I have been unable to configure the Jasper Reports Server.]

You will need to check on the Fishbowl docs how to set that up since that is specific for how that product has embedded Jasper Reports and which version of Jasper Reports they use. Based on the link below they use an old version so you will need to set JSS in compatibility mode (in the JSS Property dialog) for that particular version

https://www.fishbowlinventory.com/wiki/IReport

[How to keep line separator with CLOB]

That is because you have /n and your line separator may be different check System.getProperty("line.separator")

In this cases I prefer to use styled test. You can do this, replce the "/n" with breaks <br>:

myText.replace("n", "<br>");

And then In the properties window of the text Field select "html" in the “Markup” drop down (see screenshot below). Also remember to select "Stretch with Overflow" so the txt field will stretch when the text is long.

These are the markup options you have for your reference, check the JasperReports Doc Samples:

• none - The content of the text element is plain text. There is nothing to be processed. This is the default value.
• styled - The content of the text element is styled text, the JasperReports proprietary XML type of markup text. It overrides the deprecated isStyledText attribute. (See the Styled text sample)
• html - The content of the text element is Hyper Text Markup Language
• rtf - The content of the text element is Rich Text Format

 

[Changing the default colors in Ad Hoc Charts Jaspersoft 6.0.1]

For 6.0.1 you need to follow the same instrucctions as for 5.x versions check this article http://community.jaspersoft.com/wiki/how-modify-jasperreports-server-561-default-html5-color-palette Remembet that this will affect all Adhoc Charts since it is a server level setting.

Starting in 6.2 Jaspersfot added the posibility to change/control those color at the AdHoc level per chart, so upgrading will probably be best :) You can find more info about this in the 6.2 Documentation and also in the What's New in Jaspersoft 6.2 Page. Take a look at this video for a demo

[When will Jasper Server Pro 6.2 be available on AWS?]

As of this week Jaspersoft 6.2 is available in AWS check the new listings https://aws.amazon.com/marketplace/seller-profile/ref=dtl_pcp_sold_by?ie=UTF8&id=2f081133-0d6f-4a3d-bf94-d27abf858f56