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hrmsEjb/net/sf/jasperreports/engine/design/JRJavacCompiler.java

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+package net.sf.jasperreports.engine.design;
+
+import java.io.ByteArrayOutputStream;
+import java.io.File;
+import java.io.InputStream;
+import net.sf.jasperreports.engine.JRException;
+
+public class JRJavacCompiler extends JRAbstractMultiClassCompiler {
+  public String compileClasses(File[] sourceFiles, String classpath) throws JRException {
+    String[] source = new String[sourceFiles.length + 3];
+    source[0] = "javac";
+    source[1] = "-classpath";
+    source[2] = classpath;
+    for (int i = 0; i < sourceFiles.length; i++)
+      source[i + 3] = sourceFiles[i].getPath(); 
+    try {
+      Process compile = Runtime.getRuntime().exec(source);
+      InputStream errFile = compile.getErrorStream();
+      ByteArrayOutputStream baos = new ByteArrayOutputStream();
+      byte[] buffer = new byte[1024];
+      int count = 0;
+      do {
+        count = errFile.read(buffer);
+        if (count <= 0)
+          continue; 
+        baos.write(buffer, 0, count);
+      } while (count >= 0);
+      if (baos.toString().indexOf("error") != -1)
+        return baos.toString(); 
+      return null;
+    } catch (Exception e) {
+      StringBuffer files = new StringBuffer();
+      for (int j = 0; j < sourceFiles.length; j++) {
+        files.append(sourceFiles[j].getPath());
+        files.append(' ');
+      } 
+      throw new JRException("Error compiling report java source files : " + files, e);
+    } 
+  }
+}