Add support for large PDF templates.

@@ -35,16 +35,25 @@ public class LibreOfficeRenderer {
             context.put("Linux_X86_64", "$Linux_X86_64");
             context.put("Build", "$Build");
 
+            String output = "";
+            int idx = 0;
+
+            while (idx < template.length()) {
+                int remaining = template.length() - idx;
+                int chunkLength = remaining < 64000 ? remaining : 64000;
+                String tmplChunk = template.substring(idx, idx + chunkLength);
                 SimpleTemplateEngine engine = new SimpleTemplateEngine();
-            Writable stTemplate = engine.createTemplate(template).make(context);
-            String output = stTemplate.toString();
+                Writable stTemplate = engine.createTemplate(tmplChunk).make(context);
+                output += stTemplate.toString();
+                idx += chunkLength;
+            }
 
             File outputFile = File.createTempFile("bfdcs-", "-tmpl");
             UtilIO.writeString(outputFile, output);
 
             List<String> args = Arrays.asList(new String[]{"libreoffice", "--headless", "--convert-to", "pdf", outputFile.getPath(), "--outdir", "/tmp"});
             ProcessBuilder pb = new ProcessBuilder(args);
-            Map env = pb.environment();
+            Map<String, String> env = pb.environment();
             env.put("HOME", "/home/ofbiz");
             env.put("USERNAME", "ofbiz");
             Process process = pb.start();