removed dependency on jetbrains annotations

Author: Sagar Agarwal

google-cloud-spanner/pom.xml

@@ -455,12 +455,6 @@
       <artifactId>opentelemetry-sdk-testing</artifactId>
       <scope>test</scope>
     </dependency>
-    <dependency>
-      <groupId>org.jetbrains</groupId>
-      <artifactId>annotations</artifactId>
-      <version>24.1.0</version>
-      <scope>compile</scope>
-    </dependency>
   </dependencies>
   <profiles>
     <profile>

google-cloud-spanner/src/main/java/com/google/cloud/spanner/Interval.java

@@ -16,13 +16,13 @@
 
 package com.google.cloud.spanner;
 
+import com.google.api.client.util.Preconditions;
 import com.google.errorprone.annotations.Immutable;
 import java.io.Serializable;
 import java.math.BigDecimal;
 import java.math.BigInteger;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-import org.jetbrains.annotations.NotNull;
 
 /**
  * Represents the time duration as a combination of months, days and nanoseconds. Nanoseconds are
@@ -116,7 +116,7 @@ public static Interval ofMicros(long micros) {
   }
 
   /** Creates an interval with specified number of nanoseconds. */
-  public static Interval ofNanos(@NotNull BigInteger nanos) {
+  public static Interval ofNanos(BigInteger nanos) {
     return builder().setNanos(nanos).build();
   }
 
@@ -264,7 +264,7 @@ Builder setDays(int days) {
     }
 
     Builder setNanos(BigInteger nanos) {
-      this.nanos = nanos;
+      this.nanos = Preconditions.checkNotNull(nanos);
       return this;
     }
 

google-cloud-spanner/src/main/java/com/google/cloud/spanner/Value.java

@@ -52,7 +52,6 @@
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 import javax.annotation.concurrent.Immutable;
-import org.jetbrains.annotations.NotNull;
 
 /**
  * Represents a value to be consumed by the Cloud Spanner API. A value can be {@code NULL} or
@@ -1862,8 +1861,9 @@ com.google.protobuf.Value valueToProto() {
       return com.google.protobuf.Value.newBuilder().setStringValue(value.toISO8601()).build();
     }
 
+    @Nonnull
     @Override
-    public @NotNull String getAsString() {
+    public String getAsString() {
       return isNull() ? NULL_STRING : value.toISO8601();
     }
   }
@@ -2888,7 +2888,7 @@ void appendElement(StringBuilder b, Interval element) {
     }
 
     @Override
-    String elementToString(@NotNull Interval element) {
+    String elementToString(Interval element) {
       return element.toISO8601();
     }
   }