For the past 1 week we are facing this issue in one of our clients called "could-not-initialize-class-net-sf-jasperreports-engine-util-jrstyledtextparser" which raises while generating the report through Apache Tomcat for Windows. The strange thing is that the issue causes only in one server whereas in other servers having the replica of the server in which the error is caused is working well and good(Both has same configuration). Once what we did was to revamp the OS and it fixed the issue. Since it occurred again, this is very critical as we always can't go for revamp. We are looking for cause of this error. I also looked into the code at which line this error occurred. It was "JasperFillManager.fillReport(jasperReport, jasperParameter, jdbcConnection)".
Looking forward for a solution on urgent basis.!!!