JVM crashing with VBOs using LWJGL

Question

Every time I try to run my LWJGL application the JVM crashes. It seems to be related to adding multiple triangles to my VBO.

Here is my initialization code

float[] vertices = {
    -0.5f, 0.5f, 0f,
    -0.5f, -0.5f, 0f,
    0.5f, -0.5f, 0f,

    0.5f, -0.5f, 0f,
    0.5f, 0.5f, 0f,
    -0.5f, 0.5f, 0f
};

vertexCount = vertices.length / 3;

FloatBuffer verticesBuffer = BufferUtils.createFloatBuffer(vertices.length);
verticesBuffer.put(vertices);
verticesBuffer.flip();

vboId = glGenBuffers();
glBindBuffer(GL_ARRAY_BUFFER, vboId);
glBufferData(GL_ARRAY_BUFFER, verticesBuffer, GL_STATIC_DRAW);
glVertexPointer(vertexCount, GL_FLOAT, 0, 0L);

glBindBuffer(GL_ARRAY_BUFFER, 0);

And this is my rendering code

glEnableClientState(GL_VERTEX_ARRAY);   
glDrawArrays(GL_TRIANGLES, 0, vertexCount);
glDisableClientState(GL_VERTEX_ARRAY);

When I remove the last 9 values in the vertices array it works fine, but if I keep those, or add more, the JVM will crash.

Answer 1

The first argument to glVertexPointer is the number of coordinates per vertex, not the number of vertices. So change that line to this:

glVertexPointer(3, GL_FLOAT, 0, 0L);