`h2o` was working before on my laptop, but I didn't use it for a while 
(and have installed new packages and updated things in the meantime). Yesterday I tried using it, but it didn't work. I erased the `R` `h2o` packaged and I've reinstalled `h2o` from scratch with

```
install.packages("h2o")

```

I tried running `h2o` with `h2o.init()` but it gives me this error

```
java version "9"
Java(TM) SE Runtime Environment (build 9+181)
Java HotSpot(TM) 64-Bit Server VM (build 9+181, mixed mode)

Starting H2O JVM and connecting: ............................................................ 
[1] "localhost"
[1] 54321
[1] TRUE
[1] -1
[1] "Failed to connect to localhost port 54321: Connection refused"
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0curl: (7) Failed to connect to localhost port 54321: Connection refused
[1] 7
Error in h2o.init() : H2O failed to start, stopping execution.

```

When I look at the error log it shows

```
Only Java 1.6-1.8 supported, version is 9

```

I tried to look for more info and I think the error is triggered by [this code](https://github.com/h2oai/h2o-3/blob/master/h2o-core/src/main/java/water/H2O.java) on line 1836:

```
if (version != null && !(version.startsWith("1.6") || version.startsWith("1.7") || version.startsWith("1.8"))) {
  System.err.println("Only Java 1.6-1.8 supported, version is " + version);
  return true;

```

So it seems `h2o` is checking for a version that starts with 1.6, 1.7 and 1.8 but my version for some reason starts with 9! 
However, on the terminal, `java -version` gives

```
openjdk version "1.8.0_121"
OpenJDK Runtime Environment (Zulu 8.20.0.5-macosx) (build 1.8.0_121-b15)
OpenJDK 64-Bit Server VM (Zulu 8.20.0.5-macosx) (build 25.121-b15, mixed mode)

```

and `which java` gives

```
/Users/myusername/anaconda3/bin/java

```

------------ EDIT -------

More info: `/usr/libexec/java_home -V` gives

```
Matching Java Virtual Machines (4):
    9, x86_64:  "Java SE 9" /Library/Java/JavaVirtualMachines/jdk-9.jdk/Contents/Home
    1.8.0_144, x86_64:  "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home
    1.8.0_51, x86_64:   "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_51.jdk/Contents/Home
    1.8.0_25, x86_64:   "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_25.jdk/Contents/Home

```

Which explains the `9` that `h2o` is seeing. I find it weird that it expects `1.x.0` but the version is just `9`. In any case, it seems I need to point that `h2o.init()` command to the `1.8` java, but I couldn't figure out how to do it.

I usually use `brew` to install most things, but I never use `java` so I don't know anything about the versions.

Thanks and best!