Improved java classes code quality.

...ionpod/PresentationConversionCompletedSysPubMsgHdlr.scala

...g/bigbluebutton/core/apps/users/UserLeaveReqMsgHdlr.scala

.../src/main/scala/org/bigbluebutton/common2/util/Util.scala

...on-web/src/main/java/org/bigbluebutton/api/ApiParams.java

...b/src/main/java/org/bigbluebutton/api/MeetingService.java

.../main/java/org/bigbluebutton/api/ParamsProcessorUtil.java

...src/main/java/org/bigbluebutton/api/RecordingService.java

bbb-common-web/src/main/java/org/bigbluebutton/api/Util.java

...b/src/main/java/org/bigbluebutton/api/domain/Meeting.java

...g/bigbluebutton/api/messaging/ReceivedMessageHandler.java

.../org/bigbluebutton/api/messaging/RedisStorageService.java

...ava/org/bigbluebutton/common/messages/MessageBuilder.java

...igbluebutton/presentation/ConversionMessageConstants.java

...tton/presentation/OfficeToPdfConversionSuccessFilter.java

...uebutton/presentation/PresentationUrlDownloadService.java

...gbluebutton/presentation/imp/ExternalProcessExecutor.java

...n/presentation/imp/ImageToSwfSlidesGenerationService.java

...gbluebutton/presentation/imp/Office2PdfPageConverter.java

.../bigbluebutton/presentation/imp/Pdf2SwfPageConverter.java

...ton/presentation/imp/PdfToSwfSlidesGenerationService.java