[Java] Support calling functions returning void (#5494)

java/api/src/main/java/org/ray/api/function/RayFunc0.java

@@ -7,5 +7,6 @@ package org.ray.api.function;
  */
 @FunctionalInterface
 public interface RayFunc0<R> extends RayFunc {
-  R apply();
+
+  R apply() throws Exception;
 }

java/api/src/main/java/org/ray/api/function/RayFunc1.java

@@ -7,5 +7,6 @@ package org.ray.api.function;
  */
 @FunctionalInterface
 public interface RayFunc1<T0, R> extends RayFunc {
-  R apply(T0 t0);
+
+  R apply(T0 t0) throws Exception;
 }

java/api/src/main/java/org/ray/api/function/RayFunc2.java

@@ -7,5 +7,6 @@ package org.ray.api.function;
  */
 @FunctionalInterface
 public interface RayFunc2<T0, T1, R> extends RayFunc {
-  R apply(T0 t0, T1 t1);
+
+  R apply(T0 t0, T1 t1) throws Exception;
 }

java/api/src/main/java/org/ray/api/function/RayFunc3.java

@@ -7,5 +7,6 @@ package org.ray.api.function;
  */
 @FunctionalInterface
 public interface RayFunc3<T0, T1, T2, R> extends RayFunc {
-  R apply(T0 t0, T1 t1, T2 t2);
+
+  R apply(T0 t0, T1 t1, T2 t2) throws Exception;
 }

java/api/src/main/java/org/ray/api/function/RayFunc4.java

@@ -7,5 +7,6 @@ package org.ray.api.function;
  */
 @FunctionalInterface
 public interface RayFunc4<T0, T1, T2, T3, R> extends RayFunc {
-  R apply(T0 t0, T1 t1, T2 t2, T3 t3);
+
+  R apply(T0 t0, T1 t1, T2 t2, T3 t3) throws Exception;
 }

java/api/src/main/java/org/ray/api/function/RayFunc5.java

@@ -7,5 +7,6 @@ package org.ray.api.function;
  */
 @FunctionalInterface
 public interface RayFunc5<T0, T1, T2, T3, T4, R> extends RayFunc {
-  R apply(T0 t0, T1 t1, T2 t2, T3 t3, T4 t4);
+
+  R apply(T0 t0, T1 t1, T2 t2, T3 t3, T4 t4) throws Exception;
 }

java/api/src/main/java/org/ray/api/function/RayFunc6.java

@@ -7,5 +7,6 @@ package org.ray.api.function;
  */
 @FunctionalInterface
 public interface RayFunc6<T0, T1, T2, T3, T4, T5, R> extends RayFunc {
-  R apply(T0 t0, T1 t1, T2 t2, T3 t3, T4 t4, T5 t5);
+
+  R apply(T0 t0, T1 t1, T2 t2, T3 t3, T4 t4, T5 t5) throws Exception;
 }

java/api/src/main/java/org/ray/api/function/RayFuncVoid.java

@@ -0,0 +1,8 @@
+package org.ray.api.function;
+
+/**
+ * Interface of all `RayFuncVoidX` classes.
+ */
+public interface RayFuncVoid extends RayFunc {
+
+}

java/api/src/main/java/org/ray/api/function/RayFuncVoid0.java

@@ -0,0 +1,12 @@
+// generated automatically, do not modify.
+
+package org.ray.api.function;
+
+/**
+ * Functional interface for a remote function that has 0 parameter.
+ */
+@FunctionalInterface
+public interface RayFuncVoid0 extends RayFuncVoid {
+
+  void apply() throws Exception;
+}

java/api/src/main/java/org/ray/api/function/RayFuncVoid1.java

@@ -0,0 +1,12 @@
+// generated automatically, do not modify.
+
+package org.ray.api.function;
+
+/**
+ * Functional interface for a remote function that has 1 parameter.
+ */
+@FunctionalInterface
+public interface RayFuncVoid1<T0> extends RayFuncVoid {
+
+  void apply(T0 t0) throws Exception;
+}

java/api/src/main/java/org/ray/api/function/RayFuncVoid2.java

@@ -0,0 +1,12 @@
+// generated automatically, do not modify.
+
+package org.ray.api.function;
+
+/**
+ * Functional interface for a remote function that has 2 parameters.
+ */
+@FunctionalInterface
+public interface RayFuncVoid2<T0, T1> extends RayFuncVoid {
+
+  void apply(T0 t0, T1 t1) throws Exception;
+}

java/api/src/main/java/org/ray/api/function/RayFuncVoid3.java

@@ -0,0 +1,12 @@
+// generated automatically, do not modify.
+
+package org.ray.api.function;
+
+/**
+ * Functional interface for a remote function that has 3 parameters.
+ */
+@FunctionalInterface
+public interface RayFuncVoid3<T0, T1, T2> extends RayFuncVoid {
+
+  void apply(T0 t0, T1 t1, T2 t2) throws Exception;
+}

java/api/src/main/java/org/ray/api/function/RayFuncVoid4.java

@@ -0,0 +1,12 @@
+// generated automatically, do not modify.
+
+package org.ray.api.function;
+
+/**
+ * Functional interface for a remote function that has 4 parameters.
+ */
+@FunctionalInterface
+public interface RayFuncVoid4<T0, T1, T2, T3> extends RayFuncVoid {
+
+  void apply(T0 t0, T1 t1, T2 t2, T3 t3) throws Exception;
+}

java/api/src/main/java/org/ray/api/function/RayFuncVoid5.java

@@ -0,0 +1,12 @@
+// generated automatically, do not modify.
+
+package org.ray.api.function;
+
+/**
+ * Functional interface for a remote function that has 5 parameters.
+ */
+@FunctionalInterface
+public interface RayFuncVoid5<T0, T1, T2, T3, T4> extends RayFuncVoid {
+
+  void apply(T0 t0, T1 t1, T2 t2, T3 t3, T4 t4) throws Exception;
+}

java/api/src/main/java/org/ray/api/function/RayFuncVoid6.java

@@ -0,0 +1,12 @@
+// generated automatically, do not modify.
+
+package org.ray.api.function;
+
+/**
+ * Functional interface for a remote function that has 6 parameters.
+ */
+@FunctionalInterface
+public interface RayFuncVoid6<T0, T1, T2, T3, T4, T5> extends RayFuncVoid {
+
+  void apply(T0 t0, T1 t1, T2 t2, T3 t3, T4 t4, T5 t5) throws Exception;
+}