src/main/java/org/apache/log4j/rolling/RollingFileAppender.java [248:269]:
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              boolean success = true;

              if (rollover.getSynchronous() != null) {
                success = false;

                try {
                  success = rollover.getSynchronous().execute();
                } catch (Exception ex) {
                  exception = ex;
                }
              }

              if (success) {
                if (rollover.getAppend()) {
                  fileLength = new File(rollover.getActiveFileName()).length();
                } else {
                  fileLength = 0;
                }

                if (rollover.getAsynchronous() != null) {
                  lastRolloverAsyncAction = rollover.getAsynchronous();
                  new Thread(lastRolloverAsyncAction).start();
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src/main/java/org/apache/log4j/rolling/RollingFileAppender.java [296:317]:
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              boolean success = true;

              if (rollover.getSynchronous() != null) {
                success = false;

                try {
                  success = rollover.getSynchronous().execute();
                } catch (Exception ex) {
                  exception = ex;
                }
              }

              if (success) {
                if (rollover.getAppend()) {
                  fileLength = new File(rollover.getActiveFileName()).length();
                } else {
                  fileLength = 0;
                }

                if (rollover.getAsynchronous() != null) {
                  lastRolloverAsyncAction = rollover.getAsynchronous();
                  new Thread(lastRolloverAsyncAction).start();
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