--- /dev/null
+package org.argeo.cms.integration;
+
+import java.io.IOException;
+import java.io.Writer;
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.servlet.http.HttpServletResponse;
+
+import org.argeo.api.cms.CmsLog;
+
+import com.fasterxml.jackson.core.JsonGenerator;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+/** Serialisable wrapper of a {@link Throwable}. */
+public class CmsExceptionsChain {
+ public final static CmsLog log = CmsLog.getLog(CmsExceptionsChain.class);
+
+ private List<SystemException> exceptions = new ArrayList<>();
+
+ public CmsExceptionsChain() {
+ super();
+ }
+
+ public CmsExceptionsChain(Throwable exception) {
+ writeException(exception);
+ if (log.isDebugEnabled())
+ log.error("Exception chain", exception);
+ }
+
+ public String toJsonString(ObjectMapper objectMapper) {
+ try {
+ return objectMapper.writerWithDefaultPrettyPrinter().writeValueAsString(this);
+ } catch (JsonProcessingException e) {
+ throw new IllegalStateException("Cannot write system exceptions " + toString(), e);
+ }
+ }
+
+ public void writeAsJson(ObjectMapper objectMapper, Writer writer) {
+ try {
+ JsonGenerator jg = objectMapper.writerWithDefaultPrettyPrinter().getFactory().createGenerator(writer);
+ jg.writeObject(this);
+ } catch (IOException e) {
+ throw new IllegalStateException("Cannot write system exceptions " + toString(), e);
+ }
+ }
+
+ public void writeAsJson(ObjectMapper objectMapper, HttpServletResponse resp) {
+ try {
+ resp.setContentType("application/json");
+ resp.setStatus(500);
+ writeAsJson(objectMapper, resp.getWriter());
+ } catch (IOException e) {
+ throw new IllegalStateException("Cannot write system exceptions " + toString(), e);
+ }
+ }
+
+ /** recursive */
+ protected void writeException(Throwable exception) {
+ SystemException systemException = new SystemException(exception);
+ exceptions.add(systemException);
+ Throwable cause = exception.getCause();
+ if (cause != null)
+ writeException(cause);
+ }
+
+ public List<SystemException> getExceptions() {
+ return exceptions;
+ }
+
+ public void setExceptions(List<SystemException> exceptions) {
+ this.exceptions = exceptions;
+ }
+
+ /** An exception in the chain. */
+ public static class SystemException {
+ private String type;
+ private String message;
+ private List<String> stackTrace;
+
+ public SystemException() {
+ }
+
+ public SystemException(Throwable exception) {
+ this.type = exception.getClass().getName();
+ this.message = exception.getMessage();
+ this.stackTrace = new ArrayList<>();
+ StackTraceElement[] elems = exception.getStackTrace();
+ for (int i = 0; i < elems.length; i++)
+ stackTrace.add("at " + elems[i].toString());
+ }
+
+ public String getType() {
+ return type;
+ }
+
+ public void setType(String type) {
+ this.type = type;
+ }
+
+ public String getMessage() {
+ return message;
+ }
+
+ public void setMessage(String message) {
+ this.message = message;
+ }
+
+ public List<String> getStackTrace() {
+ return stackTrace;
+ }
+
+ public void setStackTrace(List<String> stackTrace) {
+ this.stackTrace = stackTrace;
+ }
+
+ @Override
+ public String toString() {
+ return "System exception: " + type + ", " + message + ", " + stackTrace;
+ }
+
+ }
+
+ @Override
+ public String toString() {
+ return exceptions.toString();
+ }
+
+// public static void main(String[] args) throws Exception {
+// try {
+// try {
+// try {
+// testDeeper();
+// } catch (Exception e) {
+// throw new Exception("Less deep exception", e);
+// }
+// } catch (Exception e) {
+// throw new RuntimeException("Top exception", e);
+// }
+// } catch (Exception e) {
+// CmsExceptionsChain vjeSystemErrors = new CmsExceptionsChain(e);
+// ObjectMapper objectMapper = new ObjectMapper();
+// System.out.println(objectMapper.writerWithDefaultPrettyPrinter().writeValueAsString(vjeSystemErrors));
+// System.out.println(objectMapper.writerWithDefaultPrettyPrinter().writeValueAsString(e));
+// e.printStackTrace();
+// }
+// }
+//
+// static void testDeeper() throws Exception {
+// throw new IllegalStateException("Deep exception");
+// }
+
+}