diff --git a/reactor/API/src/jetbrains/mps/logic/reactor/constraint/Instructible.java b/reactor/API/src/jetbrains/mps/logic/reactor/constraint/Instructible.java
index 3e2bb04a..e150bb69 100644
--- a/reactor/API/src/jetbrains/mps/logic/reactor/constraint/Instructible.java
+++ b/reactor/API/src/jetbrains/mps/logic/reactor/constraint/Instructible.java
@@ -5,6 +5,6 @@ package jetbrains.mps.logic.reactor.constraint;
 
 public interface Instructible {
 
-  public void tell(Symbol symbol, Object... arg);
+  public void tell(Symbol symbol, Object... args);
 
 }
diff --git a/reactor/API/src/jetbrains/mps/logic/reactor/constraint/JavaPredicate.java b/reactor/API/src/jetbrains/mps/logic/reactor/constraint/JavaPredicate.java
new file mode 100644
index 00000000..1043d0d6
--- /dev/null
+++ b/reactor/API/src/jetbrains/mps/logic/reactor/constraint/JavaPredicate.java
@@ -0,0 +1,24 @@
+package jetbrains.mps.logic.reactor.constraint;
+
+/*Generated by MPS */
+
+
+public class JavaPredicate extends AbstractPredicate {
+
+  private JavaPredicateSymbol symbol;
+
+  public JavaPredicate(JavaPredicateSymbol predicateSymbol, String id, Object... args) {
+    super(args);
+    this.id = id;
+    this.symbol = predicateSymbol;
+  }
+
+  public String id() {
+    return id;
+  }
+
+  public PredicateSymbol symbol() {
+    return symbol;
+  }
+  private String id;
+}
diff --git a/reactor/API/src/jetbrains/mps/logic/reactor/constraint/JavaPredicateSymbol.java b/reactor/API/src/jetbrains/mps/logic/reactor/constraint/JavaPredicateSymbol.java
index d972ff62..6edd15a5 100644
--- a/reactor/API/src/jetbrains/mps/logic/reactor/constraint/JavaPredicateSymbol.java
+++ b/reactor/API/src/jetbrains/mps/logic/reactor/constraint/JavaPredicateSymbol.java
@@ -5,12 +5,18 @@ package jetbrains.mps.logic.reactor.constraint;
 
 public class JavaPredicateSymbol extends PredicateSymbol {
 
-  public JavaPredicateSymbol(String expression, int arity) {
-    super(expression, arity);
+  public static final JavaPredicateSymbol EXPRESSION0 = new JavaPredicateSymbol(1);
+
+  public static final JavaPredicateSymbol EXPRESSION1 = new JavaPredicateSymbol(2);
+
+  public static final JavaPredicateSymbol EXPRESSION2 = new JavaPredicateSymbol(3);
+
+  public static final JavaPredicateSymbol EXPRESSION3 = new JavaPredicateSymbol(4);
+
+  private static final String EXPRESSION = "expression";
+
+  public JavaPredicateSymbol(int arity) {
+    super(EXPRESSION, arity);
   }
 
-  @Override
-  public String toString() {
-    return "J:" + id() + "/" + arity();
-  }
 }
diff --git a/reactor/API/src/jetbrains/mps/logic/reactor/constraint/Queryable.java b/reactor/API/src/jetbrains/mps/logic/reactor/constraint/Queryable.java
index 456a23a4..3242b9f5 100644
--- a/reactor/API/src/jetbrains/mps/logic/reactor/constraint/Queryable.java
+++ b/reactor/API/src/jetbrains/mps/logic/reactor/constraint/Queryable.java
@@ -5,6 +5,6 @@ package jetbrains.mps.logic.reactor.constraint;
 
 public interface Queryable extends Instructible {
 
-  public boolean ask(PredicateSymbol predicateSymbol, Object... arg);
+  public boolean ask(PredicateSymbol predicateSymbol, Object... args);
 
 }
diff --git a/reactor/API/src/jetbrains/mps/logic/reactor/constraint/trace.info b/reactor/API/src/jetbrains/mps/logic/reactor/constraint/trace.info
index f56bf2c6..58ee54ff 100644
--- a/reactor/API/src/jetbrains/mps/logic/reactor/constraint/trace.info
+++ b/reactor/API/src/jetbrains/mps/logic/reactor/constraint/trace.info
@@ -9,6 +9,7 @@
   <concept fqn="jetbrains.mps.baseLanguage.structure.LocalVariableDeclarationStatement" />
   <concept fqn="jetbrains.mps.baseLanguage.structure.ReturnStatement" />
   <concept fqn="jetbrains.mps.baseLanguage.structure.Statement" />
+  <concept fqn="jetbrains.mps.baseLanguage.structure.StaticFieldDeclaration" />
   <concept fqn="jetbrains.mps.baseLanguage.structure.StaticMethodDeclaration" />
   <concept fqn="jetbrains.mps.baseLanguage.structure.SuperConstructorInvocation" />
   <concept fqn="jetbrains.mps.baseLanguage.structure.ThrowStatement" />
@@ -34,9 +35,9 @@
   <root nodeRef="r:2a79c8aa-e372-4c00-8d71-5d7f3db517e4(jetbrains.mps.logic.reactor.constraint)/5841747851381496683">
     <file name="ConstraintSymbol.java">
       <node id="5841747851381535271" at="11,63,12,43" concept="7" />
-      <node id="6317379717814129922" at="15,49,16,21" concept="10" />
+      <node id="6317379717814129922" at="15,49,16,21" concept="11" />
       <node id="5841747851383361011" at="20,28,21,32" concept="7" />
-      <node id="5841747851381533067" at="11,0,14,0" concept="9" trace="symbol#(Ljava/lang/String;I)Ljetbrains/mps/logic/reactor/constraint/ConstraintSymbol;" />
+      <node id="5841747851381533067" at="11,0,14,0" concept="10" trace="symbol#(Ljava/lang/String;I)Ljetbrains/mps/logic/reactor/constraint/ConstraintSymbol;" />
       <node id="5841747851381516224" at="15,0,18,0" concept="0" trace="ConstraintSymbol#(Ljava/lang/String;I)V" />
       <node id="5841747851383347181" at="19,0,23,0" concept="5" trace="toString#()Ljava/lang/String;" />
       <scope id="5841747851381533071" at="11,63,12,43" />
@@ -111,7 +112,7 @@
   </root>
   <root nodeRef="r:2a79c8aa-e372-4c00-8d71-5d7f3db517e4(jetbrains.mps.logic.reactor.constraint)/6317379717814173903">
     <file name="PredicateSymbol.java">
-      <node id="6317379717823619735" at="8,48,9,21" concept="10" />
+      <node id="6317379717823619735" at="8,48,9,21" concept="11" />
       <node id="6317379717814175785" at="13,28,14,34" concept="7" />
       <node id="6317379717814174713" at="8,0,11,0" concept="0" trace="PredicateSymbol#(Ljava/lang/String;I)V" />
       <node id="6317379717814175781" at="12,0,16,0" concept="5" trace="toString#()Ljava/lang/String;" />
@@ -136,18 +137,18 @@
   </root>
   <root nodeRef="r:2a79c8aa-e372-4c00-8d71-5d7f3db517e4(jetbrains.mps.logic.reactor.constraint)/6317379717817889711">
     <file name="JavaPredicateSymbol.java">
-      <node id="6317379717817889916" at="8,60,9,29" concept="10" />
-      <node id="6317379717817890474" at="13,28,14,39" concept="7" />
-      <node id="6317379717817889762" at="8,0,11,0" concept="0" trace="JavaPredicateSymbol#(Ljava/lang/String;I)V" />
-      <node id="6317379717817890115" at="12,0,16,0" concept="5" trace="toString#()Ljava/lang/String;" />
-      <scope id="6317379717817889766" at="8,60,9,29" />
-      <scope id="6317379717817890126" at="13,28,14,39" />
-      <scope id="6317379717817889762" at="8,0,11,0">
+      <node id="1445804513729425338" at="8,0,9,0" concept="9" trace="EXPRESSION0" />
+      <node id="1445804513729425524" at="10,0,11,0" concept="9" trace="EXPRESSION1" />
+      <node id="1445804513729425633" at="12,0,13,0" concept="9" trace="EXPRESSION2" />
+      <node id="1445804513729425764" at="14,0,15,0" concept="9" trace="EXPRESSION3" />
+      <node id="1445804513728312018" at="16,0,17,0" concept="9" trace="EXPRESSION" />
+      <node id="6317379717817889916" at="18,41,19,29" concept="11" />
+      <node id="6317379717817889762" at="18,0,21,0" concept="0" trace="JavaPredicateSymbol#(I)V" />
+      <scope id="6317379717817889766" at="18,41,19,29" />
+      <scope id="6317379717817889762" at="18,0,21,0">
         <var name="arity" id="6317379717817890807" />
-        <var name="expression" id="6317379717817889778" />
       </scope>
-      <scope id="6317379717817890115" at="12,0,16,0" />
-      <unit id="6317379717817889711" at="6,0,17,0" name="jetbrains.mps.logic.reactor.constraint.JavaPredicateSymbol" />
+      <unit id="6317379717817889711" at="6,0,23,0" name="jetbrains.mps.logic.reactor.constraint.JavaPredicateSymbol" />
     </file>
   </root>
   <root nodeRef="r:2a79c8aa-e372-4c00-8d71-5d7f3db517e4(jetbrains.mps.logic.reactor.constraint)/6317379717821145892">
@@ -195,11 +196,36 @@
       <unit id="6317379717821221309" at="10,0,36,0" name="jetbrains.mps.logic.reactor.constraint.AbstractConstraint" />
     </file>
   </root>
+  <root nodeRef="r:2a79c8aa-e372-4c00-8d71-5d7f3db517e4(jetbrains.mps.logic.reactor.constraint)/6430064801446726795">
+    <file name="JavaPredicate.java">
+      <node id="139299000606887712" at="8,0,9,0" concept="2" trace="symbol" />
+      <node id="5217246026232796153" at="10,88,11,16" concept="11" />
+      <node id="8018003882641225596" at="11,16,12,17" concept="1" />
+      <node id="139299000606887724" at="12,17,13,34" concept="1" />
+      <node id="8018003882641226818" at="16,22,17,14" concept="7" />
+      <node id="139299000606888682" at="20,35,21,18" concept="7" />
+      <node id="8018003882641225592" at="23,0,24,0" concept="2" trace="id" />
+      <node id="8018003882641226530" at="16,0,19,0" concept="5" trace="id#()Ljava/lang/String;" />
+      <node id="139299000606887318" at="20,0,23,0" concept="5" trace="symbol#()Ljetbrains/mps/logic/reactor/constraint/PredicateSymbol;" />
+      <node id="6430064801446743162" at="10,0,15,0" concept="0" trace="JavaPredicate#(Ljetbrains/mps/logic/reactor/constraint/JavaPredicateSymbol;Ljava/lang/String;null)V" />
+      <scope id="8018003882641226533" at="16,22,17,14" />
+      <scope id="139299000606887323" at="20,35,21,18" />
+      <scope id="6430064801446743166" at="10,88,13,34" />
+      <scope id="8018003882641226530" at="16,0,19,0" />
+      <scope id="139299000606887318" at="20,0,23,0" />
+      <scope id="6430064801446743162" at="10,0,15,0">
+        <var name="args" id="6317379717826377214" />
+        <var name="id" id="8018003882641225446" />
+        <var name="predicateSymbol" id="3186369734621192611" />
+      </scope>
+      <unit id="6430064801446726795" at="6,0,25,0" name="jetbrains.mps.logic.reactor.constraint.JavaPredicate" />
+    </file>
+  </root>
   <root nodeRef="r:2a79c8aa-e372-4c00-8d71-5d7f3db517e4(jetbrains.mps.logic.reactor.constraint)/7785665572546273004">
     <file name="Instructible.java">
       <node id="7785665572546273471" at="8,0,9,0" concept="5" trace="tell#(Ljetbrains/mps/logic/reactor/constraint/Symbol;null)V" />
       <scope id="7785665572546273471" at="8,0,9,0">
-        <var name="arg" id="7785665572546274393" />
+        <var name="args" id="7785665572546274393" />
         <var name="symbol" id="5217246026231831102" />
       </scope>
       <unit id="7785665572546273004" at="6,0,11,0" name="jetbrains.mps.logic.reactor.constraint.Instructible" />
@@ -209,7 +235,7 @@
     <file name="Queryable.java">
       <node id="7785665572546276256" at="8,0,9,0" concept="5" trace="ask#(Ljetbrains/mps/logic/reactor/constraint/PredicateSymbol;null)Z" />
       <scope id="7785665572546276256" at="8,0,9,0">
-        <var name="arg" id="7785665572546277217" />
+        <var name="args" id="7785665572546277217" />
         <var name="predicateSymbol" id="5217246026231849983" />
       </scope>
       <unit id="7785665572546275793" at="6,0,11,0" name="jetbrains.mps.logic.reactor.constraint.Queryable" />
@@ -229,7 +255,7 @@
       <node id="7785665572546333582" at="45,82,46,39" concept="1" />
       <node id="2831834914716388776" at="49,47,50,44" concept="7" />
       <node id="95655808403401608" at="54,53,55,46" concept="1" />
-      <node id="7785665572546325981" at="60,50,61,72" concept="11" />
+      <node id="7785665572546325981" at="60,50,61,72" concept="12" />
       <node id="7785665572546325992" at="62,5,63,40" concept="7" />
       <node id="7785665572546302065" at="66,0,67,0" concept="2" trace="solvers" />
       <node id="2831834914716484929" at="13,0,16,0" concept="5" trace="init#(null)V" />
diff --git a/reactor/API/src/jetbrains/mps/logic/reactor/program/EvaluationSession.java b/reactor/API/src/jetbrains/mps/logic/reactor/program/EvaluationSession.java
index 78f16968..b1995a40 100644
--- a/reactor/API/src/jetbrains/mps/logic/reactor/program/EvaluationSession.java
+++ b/reactor/API/src/jetbrains/mps/logic/reactor/program/EvaluationSession.java
@@ -20,11 +20,11 @@ public abstract class EvaluationSession {
     return ourBackend.current();
   }
 
-  public static EvaluationSession.Config newSession() {
+  public static EvaluationSession.Config newSession(PlanningSession program) {
     if (ourBackend == null) {
       throw new IllegalStateException("no backend");
     }
-    return ourBackend.createConfig();
+    return ourBackend.createConfig(program);
   }
 
   public static abstract class Config {
@@ -64,7 +64,7 @@ public abstract class EvaluationSession {
 
     public EvaluationSession current();
 
-    public EvaluationSession.Config createConfig();
+    public EvaluationSession.Config createConfig(PlanningSession program);
 
   }
 
diff --git a/reactor/API/src/jetbrains/mps/logic/reactor/program/PlanningSession.java b/reactor/API/src/jetbrains/mps/logic/reactor/program/PlanningSession.java
index c3a39d78..a5f40f01 100644
--- a/reactor/API/src/jetbrains/mps/logic/reactor/program/PlanningSession.java
+++ b/reactor/API/src/jetbrains/mps/logic/reactor/program/PlanningSession.java
@@ -22,6 +22,8 @@ public abstract class PlanningSession {
 
   public abstract String name();
 
+  public abstract SessionSolver sessionSolver();
+
   public abstract Iterable<ConstraintSymbol> constraintSymbols();
 
   public abstract List<Class<?>> constraintArgumentTypes(ConstraintSymbol constraintSymbol);
diff --git a/reactor/API/src/jetbrains/mps/logic/reactor/program/trace.info b/reactor/API/src/jetbrains/mps/logic/reactor/program/trace.info
index 486969c6..618f1ace 100644
--- a/reactor/API/src/jetbrains/mps/logic/reactor/program/trace.info
+++ b/reactor/API/src/jetbrains/mps/logic/reactor/program/trace.info
@@ -12,63 +12,65 @@
       <node id="8225968737377294958" at="17,29,18,57" concept="6" />
       <node id="8225968737380415589" at="19,5,20,50" concept="3" />
       <node id="8225968737378322884" at="23,0,24,0" concept="2" trace="name#()Ljava/lang/String;" />
-      <node id="8225968737376927920" at="25,0,26,0" concept="2" trace="constraintSymbols#()Ljava/lang/Iterable;" />
-      <node id="6317379717812927967" at="27,0,28,0" concept="2" trace="constraintArgumentTypes#(Ljetbrains/mps/logic/reactor/constraint/ConstraintSymbol;)Ljava/util/List;" />
-      <node id="8225968737376996320" at="29,0,30,0" concept="2" trace="predicateSymbols#()Ljava/lang/Iterable;" />
-      <node id="8225968737379275738" at="31,0,32,0" concept="2" trace="solverClass#(Ljetbrains/mps/logic/reactor/constraint/PredicateSymbol;)Ljava/lang/Class;" />
-      <node id="8225968737378224820" at="33,0,34,0" concept="2" trace="rules#()Ljava/lang/Iterable;" />
-      <node id="6317379717812928060" at="35,0,36,0" concept="2" trace="addRule#(Ljetbrains/mps/logic/reactor/rule/Rule;)V" />
-      <node id="2831834914712478075" at="37,0,38,0" concept="2" trace="addRules#(Ljava/util/Collection;)V" />
-      <node id="8225968737380439970" at="40,29,41,61" concept="6" />
-      <node id="8225968737380440645" at="42,5,43,25" concept="0" />
-      <node id="8225968737380440961" at="47,32,48,56" concept="6" />
-      <node id="8225968737380440968" at="49,5,50,22" concept="0" />
-      <node id="8225968737380414596" at="55,0,56,0" concept="2" trace="create#(Ljava/lang/String;Ljetbrains/mps/logic/reactor/constraint/SessionSolver;)Ljetbrains/mps/logic/reactor/program/PlanningSession;" />
-      <node id="8225968737380410563" at="59,0,60,0" concept="4" trace="ourFactory" />
+      <node id="8018003882637105523" at="25,0,26,0" concept="2" trace="sessionSolver#()Ljetbrains/mps/logic/reactor/constraint/SessionSolver;" />
+      <node id="8225968737376927920" at="27,0,28,0" concept="2" trace="constraintSymbols#()Ljava/lang/Iterable;" />
+      <node id="6317379717812927967" at="29,0,30,0" concept="2" trace="constraintArgumentTypes#(Ljetbrains/mps/logic/reactor/constraint/ConstraintSymbol;)Ljava/util/List;" />
+      <node id="8225968737376996320" at="31,0,32,0" concept="2" trace="predicateSymbols#()Ljava/lang/Iterable;" />
+      <node id="8225968737379275738" at="33,0,34,0" concept="2" trace="solverClass#(Ljetbrains/mps/logic/reactor/constraint/PredicateSymbol;)Ljava/lang/Class;" />
+      <node id="8225968737378224820" at="35,0,36,0" concept="2" trace="rules#()Ljava/lang/Iterable;" />
+      <node id="6317379717812928060" at="37,0,38,0" concept="2" trace="addRule#(Ljetbrains/mps/logic/reactor/rule/Rule;)V" />
+      <node id="2831834914712478075" at="39,0,40,0" concept="2" trace="addRules#(Ljava/util/Collection;)V" />
+      <node id="8225968737380439970" at="42,29,43,61" concept="6" />
+      <node id="8225968737380440645" at="44,5,45,25" concept="0" />
+      <node id="8225968737380440961" at="49,32,50,56" concept="6" />
+      <node id="8225968737380440968" at="51,5,52,22" concept="0" />
+      <node id="8225968737380414596" at="57,0,58,0" concept="2" trace="create#(Ljava/lang/String;Ljetbrains/mps/logic/reactor/constraint/SessionSolver;)Ljetbrains/mps/logic/reactor/program/PlanningSession;" />
+      <node id="8225968737380410563" at="61,0,62,0" concept="4" trace="ourFactory" />
       <node id="8225968737380413957" at="16,86,19,5" concept="1" />
-      <node id="8225968737380439968" at="39,69,42,5" concept="1" />
-      <node id="8225968737380440959" at="46,71,49,5" concept="1" />
+      <node id="8225968737380439968" at="41,69,44,5" concept="1" />
+      <node id="8225968737380440959" at="48,71,51,5" concept="1" />
       <node id="8225968737377303413" at="16,0,22,0" concept="5" trace="newSession#(Ljava/lang/String;Ljetbrains/mps/logic/reactor/constraint/SessionSolver;)Ljetbrains/mps/logic/reactor/program/PlanningSession;" />
-      <node id="8225968737380435904" at="39,0,45,0" concept="5" trace="setFactory#(Ljetbrains/mps/logic/reactor/program/PlanningSession/Factory;)V" />
-      <node id="8225968737380440953" at="46,0,52,0" concept="5" trace="clearFactory#(Ljetbrains/mps/logic/reactor/program/PlanningSession/Factory;)V" />
+      <node id="8225968737380435904" at="41,0,47,0" concept="5" trace="setFactory#(Ljetbrains/mps/logic/reactor/program/PlanningSession/Factory;)V" />
+      <node id="8225968737380440953" at="48,0,54,0" concept="5" trace="clearFactory#(Ljetbrains/mps/logic/reactor/program/PlanningSession/Factory;)V" />
       <scope id="8225968737380413959" at="17,29,18,57" />
       <scope id="8225968737378322884" at="23,0,24,0" />
-      <scope id="8225968737376927920" at="25,0,26,0" />
-      <scope id="6317379717812927967" at="27,0,28,0">
+      <scope id="8018003882637105523" at="25,0,26,0" />
+      <scope id="8225968737376927920" at="27,0,28,0" />
+      <scope id="6317379717812927967" at="29,0,30,0">
         <var name="constraintSymbol" id="6317379717812950981" />
       </scope>
-      <scope id="8225968737376996320" at="29,0,30,0" />
-      <scope id="8225968737379275738" at="31,0,32,0">
+      <scope id="8225968737376996320" at="31,0,32,0" />
+      <scope id="8225968737379275738" at="33,0,34,0">
         <var name="predicateSymbol" id="8225968737379275739" />
       </scope>
-      <scope id="8225968737378224820" at="33,0,34,0" />
-      <scope id="6317379717812928060" at="35,0,36,0">
+      <scope id="8225968737378224820" at="35,0,36,0" />
+      <scope id="6317379717812928060" at="37,0,38,0">
         <var name="rule" id="6317379717812951187" />
       </scope>
-      <scope id="2831834914712478075" at="37,0,38,0">
+      <scope id="2831834914712478075" at="39,0,40,0">
         <var name="rules" id="2831834914712478076" />
       </scope>
-      <scope id="8225968737380439969" at="40,29,41,61" />
-      <scope id="8225968737380440960" at="47,32,48,56" />
-      <scope id="8225968737380414596" at="55,0,56,0">
+      <scope id="8225968737380439969" at="42,29,43,61" />
+      <scope id="8225968737380440960" at="49,32,50,56" />
+      <scope id="8225968737380414596" at="57,0,58,0">
         <var name="name" id="8225968737380483470" />
         <var name="sessionSolver" id="2831834914719707086" />
       </scope>
       <scope id="6317379717812939797" at="16,86,20,50" />
-      <scope id="8225968737380435908" at="39,69,43,25" />
-      <scope id="8225968737380440958" at="46,71,50,22" />
+      <scope id="8225968737380435908" at="41,69,45,25" />
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