java - Thread issues with Itext PDF -


threads getting stuck waiting lock while using itext pdf merge pdfs in application, can on cause , fix?

java.lang.thread.run(thread.java:722)

        "[stuck] executethread: '4' queue: 'weblogic.kernel.default (self-tuning)'" runnable              com.itextpdf.text.pdf.bytebuffer.append(bytebuffer.java:225)              com.itextpdf.text.pdf.bytebuffer.append(bytebuffer.java:236)              com.itextpdf.text.pdf.pdfsmartcopy$bytestore.serobject(pdfsmartcopy.java:165)              com.itextpdf.text.pdf.pdfsmartcopy$bytestore.serarray(pdfsmartcopy.java:185)              com.itextpdf.text.pdf.pdfsmartcopy$bytestore.serobject(pdfsmartcopy.java:156)              com.itextpdf.text.pdf.pdfsmartcopy$bytestore.serdic(pdfsmartcopy.java:176)              com.itextpdf.text.pdf.pdfsmartcopy$bytestore.serobject(pdfsmartcopy.java:153)

.......

com.itextpdf.text.pdf.pdfsmartcopy$bytestore.serdic(pdfsmartcopy.java:176)

            com.itextpdf.text.pdf.pdfsmartcopy$bytestore.serobject(pdfsmartcopy.java:146)              com.itextpdf.text.pdf.pdfsmartcopy$bytestore.<init>(pdfsmartcopy.java:198)              com.itextpdf.text.pdf.pdfsmartcopy.copyindirect(pdfsmartcopy.java:93)


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