--- a/javanative/Database.java
+++ b/javanative/Database.java
@@ -135,7 +135,7 @@
   /** last happened error code */
   private int ecode;
   /** callback function to inform of database events */
-  private DatabaseInformer informer;
+  private long informer;
   //----------------------------------------------------------------
   // constructors and finalizers
   //----------------------------------------------------------------
--- a/javanative/database.c
+++ b/javanative/database.c
@@ -19,7 +19,7 @@
 
 
 /* global variables */
-JNIEnv *infoenv = NULL;
+static JavaVM* jvm = NULL;
 
 
 /* private function prototypes */
@@ -181,8 +181,8 @@
     err = TRUE;
   }
   (*env)->SetLongField(env, obj, fid, 0);
-  fid = (*env)->GetFieldID(env, cls, "informer", "L" CLSDBINFO ";");
-  if((infoobj = (*env)->GetObjectField(env, obj, fid)) != NULL)
+  fid = (*env)->GetFieldID(env, cls, "informer", "J");
+  if((infoobj = (jobject)(*env)->GetLongField(env, obj, fid)) != NULL)
     (*env)->DeleteGlobalRef(env, infoobj);
   (*env)->SetObjectField(env, obj, fid, NULL);
   return err ? FALSE : TRUE;
@@ -735,16 +735,17 @@
     throwillarg(env);
     return;
   }
-  fid = (*env)->GetFieldID(env, cls, "informer", "L" CLSDBINFO ";");
-  if((oldobj = (*env)->GetObjectField(env, obj, fid)) != NULL)
+  fid = (*env)->GetFieldID(env, cls, "informer", "J");
+  if((oldobj = (jobject)(*env)->GetLongField(env, obj, fid)) != NULL)
     (*env)->DeleteGlobalRef(env, oldobj);
   (*env)->SetObjectField(env, obj, fid, NULL);
   if(!(informer = (*env)->NewGlobalRef(env, informer))){
     throwoutmem(env);
     return;
   }
-  (*env)->SetObjectField(env, obj, fid, informer);
-  infoenv = env;
+  (*env)->SetLongField(env, obj, fid, (PTRNUM)informer);
+  if(jvm == NULL)
+    (*env)->GetJavaVM(env, &jvm);
   est_mtdb_set_informer((ESTMTDB *)(PTRNUM)coreptr, dbinform, informer);
 }
 
@@ -767,10 +768,12 @@
 
 /* callback function for database events */
 static void dbinform(const char *message, void *opaque){
+  JNIEnv *infoenv;
   jstring msgobj;
   jobject opobj;
   jclass cls;
   jmethodID mid;
+  (*jvm)->GetEnv(jvm, (void **)&infoenv, JNI_VERSION_1_8);
   if(!(msgobj = (*infoenv)->NewStringUTF(infoenv, message))) return;
   opobj = (jobject)opaque;
   cls = (*infoenv)->GetObjectClass(infoenv, opobj);
--- a/javanative/myconf.h
+++ b/javanative/myconf.h
@@ -69,7 +69,6 @@
 #define CLSDOC         "estraier/Document"
 #define CLSCOND        "estraier/Condition"
 #define CLSDB          "estraier/Database"
-#define CLSDBINFO      "estraier/DatabaseInformer"
 #define CLSRES         "estraier/Result"