[Filtering between two same date but different time]

why not try using java.sql.timestamp as parameter class.

[Crosstab to Use available space on the page instead of printing on new page]

Create a dummy group which would have least impact on your data. This can be easily achieved by creating a pseudo variable and then adding a group on it. Now click on your report name in report inspector and change columns to 2.

Drag and drop cross tab element in the group footer of the newly created group and go ahead with your crosstab creation. Run the report to find your desired output.

 

[Single SQL query for multiple components]

Create a dummy query for main report eg select 1 in case of mysql. Now create a data set which can be used for both crosstab and table. When u drag and drop table and cross tab in main report use this data set for both.  This dataset would produce results for both.

Let me know if this works for you or not.

[How to hide/ show columns for Jasper Reports with java checkbox?]

Use print when expression. Create a checkbox for every column. These checkboxes would be of boolean type. Now for every column in print when expression write a code which must be like {Checkbox}?true:false

[/code]

[SubReports]

trying executing the report using the preview button.If there is still an issue please post in the screenshots.

[SubReports]

Drag and drop subreport from palette.Use the wizard to add the subreport into your main report. If you have already created the reports that you are thinking of using as a subreport then select "Use an existing report" now add your report (reportname.jasper). Set Connection Type to "Use a connection expression" and Connection Expression to $P{REPORT_CONNECTION}. This is how you add your first subreport. Repeat this to add all the 4 subreports to your master report.